Inventor · disambiguated record
Robert F. Dray
Also filed as: DRAY ROBERT · DRAY ROBERT F · DRAY ROBERT FRANKLIN · DRAY SR ROBERT F
15 granted patents·2 pending applications·193 citations·filing 1982–2023
93Inventor score
Top patents by PatentIndex Score
17 records- 0182US10350809B2Plastic processing screwDRAY SR ROBERT F·Filed 2016·Granted Jul 16, 2019·2 cites·19 claims
- 0277US6464488B2Sliding ring non-return valveFiled 2001·Granted Oct 15, 2002·12 cites·18 claims
- 0372US4896969AMethod and apparatus for melting and conveying plasticated materialDRAY ROBERT F·Filed 1988·Granted Jan 30, 1990·32 cites·15 claims
- 0467US6988821B2Plastics screw with barrier membersDRAY SR ROBERT F·Filed 2002·Granted Jan 24, 2006·8 cites·10 claims
- 0567US6739862B2Dual cylinder injection molding apparatusFiled 2001·Granted May 25, 2004·6 cites·19 claims
- 0664US5258158APositive-type non-return valve and method of using valveDRAY ROBERT F·Filed 1991·Granted Nov 2, 1993·24 cites·36 claims
- 0759US5151282APositive-type non-return valveDRAY ROBERT F·Filed 1991·Granted Sep 29, 1992·21 cites·21 claims
- 0858US2024351258A1Injection molding apparatusDRAY SR ROBERT F·Filed 2023·Application pending·0 cites
- 0955US4723847AApparatus for varying pressure within a screw channelDRAY ROBERT F·Filed 1987·Granted Feb 9, 1988·17 cites·5 claims
- 1053US6203311B1Sliding ring non-return valveFiled 1998·Granted Mar 20, 2001·13 cites·25 claims
- 1153US4444507AApparatus and method for melting and conveying plasticated materialDRAY ROBERT F·Filed 1982·Granted Apr 24, 1984·16 cites·20 claims
- 1251US7314368B2Dual-cylinder injection molding apparatusDRAY ROBERT FRANKLIN·Filed 2004·Granted Jan 1, 2008·2 cites·17 claims
- 1351US6413076B1Shut-off nozzleFiled 1999·Granted Jul 2, 2002·14 cites·30 claims
- 1449US4842414AMixing device for a feed screwDRAY ROBERT F·Filed 1987·Granted Jun 27, 1989·14 cites·4 claims
- 1543US2004213077A1Plastic screwFiled 2003·Application pending·0 cites
- 1636US5470514AInjection molding method for a shot of determined massFiled 1993·Granted Nov 28, 1995·6 cites·9 claims
- 1731US5071255AApparatus for varying pressure within a screw channelDRAY ROBERT F·Filed 1990·Granted Dec 10, 1991·6 cites·6 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →