Individual holder
SPRUIELL WALTER L
3 granted patents·76 citations·filing 1978–1986
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
3 records- 0176US4670139ADrilling mud cleaning machineSPRUIELL WALTER L·Filed 1986·Granted Jun 2, 1987·46 cites·4 claims
- 0253US4431535ACentrifugal separator systemSPRUIELL WALTER L·Filed 1982·Granted Feb 14, 1984·15 cites·2 claims
- 0348US4269566ACentrifugal pump for abrasive liquidsSPRUIELL WALTER L·Filed 1978·Granted May 26, 1981·15 cites·2 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →