Assignee
DRAY ROBERT F
US·7 granted patents·130 citations·filing 1982–1991
Top patents by PatentIndex Score
7 records- 0172US4896969AMethod and apparatus for melting and conveying plasticated materialDRAY ROBERT F·Filed 1988·Granted Jan 30, 1990·32 cites·15 claims
- 0264US5258158APositive-type non-return valve and method of using valveDRAY ROBERT F·Filed 1991·Granted Nov 2, 1993·24 cites·36 claims
- 0359US5151282APositive-type non-return valveDRAY ROBERT F·Filed 1991·Granted Sep 29, 1992·21 cites·21 claims
- 0455US4723847AApparatus for varying pressure within a screw channelDRAY ROBERT F·Filed 1987·Granted Feb 9, 1988·17 cites·5 claims
- 0553US4444507AApparatus and method for melting and conveying plasticated materialDRAY ROBERT F·Filed 1982·Granted Apr 24, 1984·16 cites·20 claims
- 0649US4842414AMixing device for a feed screwDRAY ROBERT F·Filed 1987·Granted Jun 27, 1989·14 cites·4 claims
- 0731US5071255AApparatus for varying pressure within a screw channelDRAY ROBERT F·Filed 1990·Granted Dec 10, 1991·6 cites·6 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →