US2006163192A1PendingUtilityA1

Linerless plastic closure

49
Individually held — no corporate assignee on recordPriority: Jan 14, 2005Filed: Jan 14, 2005Published: Jul 27, 2006
Est. expiryJan 14, 2025(expired)· nominal 20-yr term from priority
Inventors:Michael Leslie PriceThomas M. Seidita
B65D 41/0428
49
PatentIndex Score
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Cited by
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References
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Claims

Abstract

An improved linerless plastic closure includes a top panel that has external and internal surfaces and a generally cylindrical sidewall that is unitary with the top panel and has an internally threaded surface that is adapted to engage with a threaded finish portion of a container. A shoulder portion is defined between the internal surface of the top panel and the internal surface of the sidewall. A linerless sealing member extends radially inwardly from the shoulder portion. A first radius is defined in the shoulder portion between the linerless sealing member and the internal surface of the top panel. A second radius is defined in the shoulder portion between the linerless sealing member and the internal surface of the sidewall. But the first and second radii are preferably configured to be at least 0.020 inches, which has been found to reduce the potential for stress-related cracking.

Claims

exact text as granted — not AI-modified
1 . An improved linerless plastic closure, comprising: 
 a top panel having external and internal surfaces;    a generally cylindrical sidewall, said sidewall being unitary with said top panel and having a threaded internal surface;    a shoulder portion defined between said internal surface of said top panel and said internal surface of said sidewall;    a linerless sealing member extending radially inwardly from said shoulder portion;    a first radius defined in said shoulder portion between said linerless sealing member and said internal surface of said top panel; and    a second radius defined in said shoulder portion between said linerless sealing member and said internal surface of said sidewall, and wherein both said first radius and said second radius are at least 0.020 inches.    
   
   
       2 . An improved linerless plastic closure according to  claim 1 , wherein both said first radius and said second radius are within a range of about 0.020 inches to about 0.036 inches.  
   
   
       3 . An improved linerless plastic closure according to  claim 2 , wherein both said first radius and said second radius are within a range of about 0.023 inches to about 0.030 inches.  
   
   
       4 . An improved linerless plastic closure according to  claim 2 , wherein said first radius is within a range of about 0.023 inches to about 0.030 inches.  
   
   
       5 . An improved linerless plastic closure according to  claim 2 , wherein said second radius is within a range of about 0.023 inches to about 0.030 inches.  
   
   
       6 . An improved linerless plastic closure according to  claim 1 , wherein said closure is fabricated from high-density polyethylene.  
   
   
       7 . An improved linerless plastic closure according to  claim 1 , wherein said shoulder portion is thicker in a radial direction than an average radial thickness of said sidewall.  
   
   
       8 . An improved linerless plastic closure according to  claim 1 , wherein said shoulder portion is thicker in a longitudinal direction than an average longitudinal thickness of said top panel.  
   
   
       9 . An improved linerless plastic closure according to  claim 1 , wherein said first radius is substantially equal to said second radius.  
   
   
       10 . An improved linerless plastic closure according to  claim 1 , wherein said first radius intersects said internal surface of said top panel  
   
   
       11 . An improved linerless plastic closure according to  claim 1 , wherein said second radius intersects said internal surface of said sidewall.  
   
   
       12 . An improved linerless plastic closure, comprising: 
 a top panel having external and internal surfaces;    a generally cylindrical sidewall, said sidewall being unitary with said top panel and having a threaded internal surface;    a shoulder portion defined between said internal surface of said top panel and said internal surface of said sidewall;    a linerless sealing member extending radially inwardly from said shoulder portion;    a first radius defined in said shoulder portion between said linerless sealing member and said internal surface of said top panel; and    a second radius defined in said shoulder portion between said linerless sealing member and said internal surface of said sidewall, and wherein said first radius is at least 0.020 inches.    
   
   
       13 . An improved linerless plastic closure according to  claim 12 , wherein said first radius is within a range of about 0.020 inches to about 0.036 inches.  
   
   
       14 . An improved linerless plastic closure according to  claim 13 , wherein said first radius is within a range of about 0.023 inches to about 0.030 inches.  
   
   
       15 . An improved linerless plastic closure according to  claim 12 , wherein said closure is fabricated from high-density polyethylene.  
   
   
       16 . An improved linerless plastic closure according to  claim 12 , wherein said shoulder portion is thicker in a radial direction than an average radial thickness of said sidewall.  
   
   
       17 . An improved linerless plastic closure according to  claim 12 , wherein said shoulder portion is thicker in a longitudinal direction than an average longitudinal thickness of said top panel.  
   
   
       18 . An improved linerless plastic closure according to  claim 12 , wherein said first radius intersects said internal surface of said top panel  
   
   
       19 . An improved linerless plastic closure according to  claim 12 , wherein said second radius intersects said internal surface of said sidewall.  
   
   
       20 . An improved linerless plastic closure, comprising: 
 a top panel having external and internal surfaces;    a generally cylindrical sidewall, said sidewall being unitary with said top panel and having a threaded internal surface;    a shoulder portion defined between said internal surface of said top panel and said internal surface of said sidewall;    a linerless sealing member extending radially inwardly from said shoulder portion;    a first radius defined in said shoulder portion between said linerless sealing member and said internal surface of said top panel; and    a second radius defined in said shoulder portion between said linerless sealing member and said internal surface of said sidewall, and wherein said second radius is at least 0.020 inches.    
   
   
       21 . An improved linerless plastic closure according to  claim 20 , wherein said second radius is within a range of about 0.020 inches to about 0.036 inches.  
   
   
       22 . An improved linerless plastic closure according to  claim 21 , wherein said second radius is within a range of about 0.023 inches to about 0.030 inches.  
   
   
       23 . An improved linerless plastic closure according to  claim 20 , wherein said closure is fabricated from high-density polyethylene.  
   
   
       24 . An improved linerless plastic closure according to  claim 20 , wherein said shoulder portion is thicker in a radial direction than an average radial thickness of said sidewall.  
   
   
       25 . An improved linerless plastic closure according to  claim 20 , wherein said shoulder portion is thicker in a longitudinal direction than an average longitudinal thickness of said top panel.  
   
   
       26 . An improved linerless plastic closure according to  claim 20 , wherein said first radius intersects said internal surface of said top panel  
   
   
       27 . An improved linerless plastic closure according to  claim 20 , wherein said second radius intersects said internal surface of said sidewall.  
   
   
       28 . An improved linerless plastic closure, comprising: 
 a top panel having external and internal surfaces;    a generally cylindrical sidewall, said sidewall being unitary with said top panel and having a threaded internal surface;    a linerless sealing member extending radially inwardly from an area that is adjacent to an area of connection between said sidewall and said top panel;    a first radius defined between said linerless sealing member and said internal surface of said top panel; and    a second radius defined between said linerless sealing member and said internal surface of said sidewall, and    wherein said first radius is at least 0.020 inches.    
   
   
       29 . An improved linerless plastic closure according to  claim 28 , wherein said first radius is within a range of about 0.020 inches to about 0.036 inches.  
   
   
       30 . An improved linerless plastic closure according to  claim 29 , wherein said first radius is within a range of about 0.023 inches to about 0.030 inches.  
   
   
       31 . An improved linerless plastic closure according to  claim 28 , wherein said closure is fabricated from high-density polyethylene.  
   
   
       32 . An improved linerless plastic closure according to  claim 28 , wherein said second radius is also at least 0.020 inches.  
   
   
       33 . An improved linerless plastic closure according to  claim 32 , wherein both said first and second radii are within a range of about 0.020 inches to about 0.036 inches.  
   
   
       34 . An improved linerless plastic closure according to  claim 33 , wherein both said first and second radii are within a range of about 0.023 inches to about 0.030 inches  
   
   
       35 . An improved linerless plastic closure, comprising: 
 a top panel having external and internal surfaces;    a generally cylindrical sidewall, said sidewall being unitary with said top panel and having a threaded internal surface;    a linerless sealing member extending radially inwardly from an area that is adjacent to an area of connection between said sidewall and said top panel;    a first radius defined between said linerless sealing member and said internal surface of said top panel; and    a second radius defined between said linerless sealing member and said internal surface of said sidewall, and wherein said second radius is at least 0.020 inches.    
   
   
       36 . An improved linerless plastic closure according to  claim 35 , wherein said second radius is within a range of about 0.020 inches to about 0.036 inches.  
   
   
       37 . An improved linerless plastic closure according to  claim 36 , wherein said second radius is within a range of about 0.023 inches to about 0.030 inches.  
   
   
       38 . An improved linerless plastic closure according to  claim 35 , wherein said closure is fabricated from high-density polyethylene.

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