Inventor · disambiguated record
David J. First
Also filed as: FIRST DAVID J · SHAW DAVID N
4 granted patents·172 citations·filing 1975–2005
80Inventor score
Top patents by PatentIndex Score
4 records- 0194US4249866AControl system for screw compressorDUNHAM BUSH INC·Filed 1978·Granted Feb 10, 1981·53 cites·27 claims
- 0292US4412788AControl system for screw compressorDURHAM BUSH INC·Filed 1981·Granted Nov 1, 1983·79 cites·22 claims
- 0380US4031532AVoltage to frequency converterFIRST DAVID J·Filed 1975·Granted Jun 21, 1977·37 cites·6 claims
- 0460US8333568B2Device and methods of measuring pressureLUONGO JOSEPH A·Filed 2005·Granted Dec 18, 2012·3 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →