Individual holder
BUTLER BRENT K
US·3 granted patents·72 citations·filing 1989–1993
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
3 records- 0175US4987381ATube sound solid-state amplifierBUTLER BRENT K·Filed 1989·Granted Jan 22, 1991·25 cites·4 claims
- 0270US5022305ATube overdrive pedal operable using low voltage DC battery eliminatorBUTLER BRENT K·Filed 1989·Granted Jun 11, 1991·26 cites·24 claims
- 0364US5343159ADirect box employing hybrid vacuum tube and solid state circuitryBUTLER BRENT K·Filed 1993·Granted Aug 30, 1994·21 cites·9 claims
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