USD271976SExpiredUtility

Piston vacuum pump

72
Assignee: Sigma TekPriority: Dec 31, 1981Filed: Dec 31, 1981Granted: Dec 27, 1983
Est. expiryDec 31, 2001(expired)· nominal 20-yr term from priority
Inventors:Forest G. Brown
72
PatentIndex Score
19
Cited by
1
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for piston vacuum pump, as shown.

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