Inventor · disambiguated record
Fred Keen
Also filed as: KEEN FRED
3 granted patents·222 citations·filing 1988–1992
78Inventor score
Top patents by PatentIndex Score
3 records- 0190US4816877ARefillable toner cartridge and method of manufacture thereofKEEN FRED·Filed 1988·Granted Mar 28, 1989·71 cites·15 claims
- 0286US5329294AUser refillable ink jet cartridge and method for making said cartridgeREPEAT O TYPE MFG CO INC·Filed 1992·Granted Jul 12, 1994·107 cites·24 claims
- 0375US5408256ARefillable color ink jet cartridge and method for making said cartridgeREPEAT O TYPE MANUFACTURING CO·Filed 1992·Granted Apr 18, 1995·44 cites·11 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →