Assignee
BUTTERWORTH SYSTEM INC
5 granted patents·169 citations·filing 1976–1996
Top patents by PatentIndex Score
5 records- 0176US4331254ASealing arrangementBUTTERWORTH SYSTEM INC·Filed 1980·Granted May 25, 1982·67 cites·16 claims
- 0274US5640983ATank cleaning deviceBUTTERWORTH SYSTEM INC·Filed 1996·Granted Jun 24, 1997·48 cites·24 claims
- 0367US4407678ASludge removal machineBUTTERWORTH SYSTEM INC·Filed 1981·Granted Oct 4, 1983·30 cites·11 claims
- 0457US4041565ARotatable brushesBUTTERWORTH SYSTEM INC·Filed 1976·Granted Aug 16, 1977·14 cites·8 claims
- 0534US4685974AMethod for clearing settled sludgeBUTTERWORTH SYSTEM INC·Filed 1983·Granted Aug 11, 1987·10 cites·2 claims
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