Inventor · disambiguated record
Fred Johannsen
Also filed as: JOHANNSEN FRED
3 granted patents·62 citations·filing 1977–1989
72Inventor score
Top patents by PatentIndex Score
3 records- 0169US4897903AMethod of providing an ink jet printing head with piezo-crystalsOLYMPIA AG·Filed 1989·Granted Feb 6, 1990·29 cites·7 claims
- 0265US5028514AMethod of producing an etched base plate for an ink print headOLYMPIA AEG·Filed 1989·Granted Jul 2, 1991·26 cites·4 claims
- 0348US4159183AKeyboard employing photoelectric key actuation sensingOLYMPIA WERKE AG·Filed 1977·Granted Jun 26, 1979·7 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →