Inventor · disambiguated record
Robert C. Berfield
Also filed as: BERFIELD ROBERT · BERFIELD ROBERT C
146 granted patents·1 pending application·3,563 citations·filing 1980–2007
99Inventor score
Top patents by PatentIndex Score
147 records- 0196US4270668ABuckle or latch for holding lid to containerSHOP VAC CORP·Filed 1980·Granted Jun 2, 1981·112 cites·18 claims
- 0295USD389962SCombined wet and dry vacuum cleanerSHOP VAC CORP·Filed 1996·Granted Jan 27, 1998·57 cites·1 claims
- 0395USD287171SMotor housing for canister type electric vacuum cleanerSHOP VAC CORP·Filed 1984·Granted Dec 9, 1986·41 cites·1 claims
- 0495US4435877ANoise reducing means for vacuum cleanerSHOP VAC CORP·Filed 1982·Granted Mar 13, 1984·88 cites·8 claims
- 0593US6107583ASwitch assembly having an enlarged actuation surfaceSHOP VAC CORP·Filed 1999·Granted Aug 22, 2000·68 cites·20 claims
- 0692USD286336STank for electric vacuum cleanerSHOP VAC CORP·Filed 1984·Granted Oct 21, 1986·28 cites·1 claims
- 0792US4501378AResilient detented lid latchSHOP VAC CORP·Filed 1983·Granted Feb 26, 1985·58 cites·25 claims
- 0891US6440191B1Vacuum cleaner filter assemblySHOP VAC CORP·Filed 2000·Granted Aug 27, 2002·62 cites·18 claims
- 0991US4797072APortable electric blowerSHOP VAC CORP·Filed 1987·Granted Jan 10, 1989·79 cites·9 claims
- 1089USD395119SDollySHOP VAC CORP·Filed 1997·Granted Jun 9, 1998·34 cites·1 claims
- 1187US6530116B2Vacuum cleaner with muffled detachable blower exhaustSHOP VAC CORP·Filed 2001·Granted Mar 11, 2003·48 cites·20 claims
- 1287US6367118B1Vacuum cleaner hose clipSHOP VAC CORP·Filed 2000·Granted Apr 9, 2002·34 cites·27 claims
- 1387USD358010SCombined wet and dry vacuum cleanerSHOP VAC CORP·Filed 1993·Granted May 2, 1995·42 cites·1 claims
- 1487US4880364APortable electric blowerSHOP VAC CORP·Filed 1988·Granted Nov 14, 1989·61 cites·5 claims
- 1587US4330899ANoise reducing blower motor housing means for vacuum cleaner, or the likeSHOP VAC CORP·Filed 1980·Granted May 25, 1982·65 cites·28 claims
- 1685US5982270AThermal fuseSHOP VAC CORP·Filed 1998·Granted Nov 9, 1999·42 cites·20 claims
- 1785US5855634AFilter retainer for a vacuum cleanerSHOP VAC CORP·Filed 1997·Granted Jan 5, 1999·61 cites·19 claims
- 1885US4906265AFilter and installation means for dry material filter for electric vacuum cleanerSHOP VAC CORP·Filed 1989·Granted Mar 6, 1990·54 cites·2 claims
- 1984US7395601B2Rotary flail feeding deviceBERFIELD ROBERT C·Filed 2007·Granted Jul 8, 2008·20 cites·16 claims
- 2084US6381803B1Vacuum cleanerSHOP VAC CORP·Filed 2000·Granted May 7, 2002·38 cites·12 claims
- 2184USD287895SMotor housing for canister type electric vacuum cleanerSHOP VAC CORP·Filed 1984·Granted Jan 20, 1987·19 cites·1 claims
- 2282USD337368STank for a pressure washerSHOP VAC CORP·Filed 1992·Granted Jul 13, 1993·22 cites·1 claims
- 2381US5743019ARotary flail feeding device and methodFiled 1995·Granted Apr 28, 1998·40 cites·72 claims
- 2481US4836753APortable electric blowerSHOP VAC CORP·Filed 1988·Granted Jun 6, 1989·47 cites·10 claims
- 2581US4462137AElectric vacuum cleanerSHOP VAC CORP·Filed 1983·Granted Jul 31, 1984·46 cites·26 claims
- 2680US5230471APressure washerSHOP VAC CORP·Filed 1991·Granted Jul 27, 1993·41 cites·23 claims
- 2780US5150499AStatic electric discharge for dust collectorSHOP VAC CORP·Filed 1990·Granted Sep 29, 1992·51 cites·17 claims
- 2880USD294414SVacuum cleaner hoseSHOP VAC CORP·Filed 1985·Granted Feb 23, 1988·22 cites·1 claims
- 2980USD294413SVacuum cleaner hoseSHOP VAC CORP·Filed 1985·Granted Feb 23, 1988·21 cites·1 claims
- 3080US4709436ADebris pan for rotary brush sweeperSHOP VAC CORP·Filed 1986·Granted Dec 1, 1987·43 cites·23 claims
- 3180US4563789AHose end holderSHOP VAC CORP·Filed 1984·Granted Jan 14, 1986·43 cites·4 claims
- 3279US5313686ATool caddy for attachment to container, particularly for a vacuum cleaner tankSHOP VAC CORP·Filed 1991·Granted May 24, 1994·46 cites·11 claims
- 3379USD341008SWheeled tank for a pressure washerSHOP VAC CORP·Filed 1991·Granted Nov 2, 1993·20 cites·1 claims
- 3479US4701969ARotary brush sweeper with easily separable debris panSHOP VAC CORP·Filed 1986·Granted Oct 27, 1987·44 cites·40 claims
- 3579US4334337ACompact wet-dry electric vacuum cleanerSHOP VAC CORP·Filed 1980·Granted Jun 15, 1982·47 cites·83 claims
- 3678US6451078B2Fitting for vacuum bagsSHOP VAC CORP·Filed 2000·Granted Sep 17, 2002·36 cites·27 claims
- 3778USD311615SVacuum cleaner nozzleSHOP VAC CORP·Filed 1987·Granted Oct 23, 1990·17 cites·1 claims
- 3877US5555597AApparatus for converting a vacuum cleaning device into a liquid dispensing and suctioning systemSHOP VAC CORP·Filed 1994·Granted Sep 17, 1996·42 cites·15 claims
- 3977US4538971AAssembly of tank lid and fan means of a wet/dry vacuumSHOP VAC CORP·Filed 1983·Granted Sep 3, 1985·37 cites·15 claims
- 4076US5920955ASelf-evacuating vacuum cleanerSHOP VAC CORP·Filed 1997·Granted Jul 13, 1999·45 cites·10 claims
- 4176USD334972SPressure spray washerSHOP VAC CORP·Filed 1990·Granted Apr 20, 1993·17 cites·1 claims
- 4276US4938421ACleaning liquid mixer for a water line, particularly for a surface cleanerSHOP VAC CORP·Filed 1989·Granted Jul 3, 1990·41 cites·25 claims
- 4374US6009596ASelf-evacuating vacuum cleanerSHOP VAC CORP·Filed 1998·Granted Jan 4, 2000·41 cites·14 claims
- 4474US5409032APressure washer bypass valveSHOP VAC CORP·Filed 1994·Granted Apr 25, 1995·31 cites·23 claims
- 4574USD341009SLarge tank for a pressure washerSHOP VAC CORP·Filed 1991·Granted Nov 2, 1993·16 cites·1 claims
- 4674USD305816SPortable blowerSHOP VAC CORP·Filed 1987·Granted Jan 30, 1990·14 cites·1 claims
- 4773US6151749AUser-carried vacuum cleanerSHOP VAC CORP·Filed 1999·Granted Nov 28, 2000·36 cites·15 claims
- 4873US5230368AChemical intake systemSHOP VAC CORP·Filed 1992·Granted Jul 27, 1993·30 cites·7 claims
- 4973US4658458ARotary brush sweeper with mechanism for brush height adjustmentSHOP VAC CORP·Filed 1986·Granted Apr 21, 1987·37 cites·18 claims
- 5072US5372158AValve with backflow preventerSHOP VAC CORP·Filed 1993·Granted Dec 13, 1994·29 cites·20 claims
Showing the top 50 of 147 patent records by PatentIndex Score.
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