Inventor · disambiguated record
Richard H. Grappendorf
Also filed as: GRAPPENDORF RICHARD H
6 granted patents·295 citations·filing 1980–1986
87Inventor score
Technology areasE21B
Top patents by PatentIndex Score
6 records- 0185US4499959ATooth configuration for an earth boring bitCHRISTENSEN INC·Filed 1983·Granted Feb 19, 1985·84 cites·13 claims
- 0284US4352400ADrill bitCHRISTENSEN INC·Filed 1980·Granted Oct 5, 1982·86 cites·11 claims
- 0375US4673044AEarth boring bit for soft to hard formationsEASTMAN CHRISTENSEN CO·Filed 1985·Granted Jun 16, 1987·61 cites·22 claims
- 0472US4586574ACutter configuration for a gage-to-shoulder transition and face patternCHRISTENSEN INC NORTON·Filed 1983·Granted May 6, 1986·41 cites·22 claims
- 0548US4491188ADiamond cutting element in a rotating bitCHRISTENSEN INC NORTON·Filed 1983·Granted Jan 1, 1985·17 cites·15 claims
- 0631US4744427ABit design for a rotating bit incorporating synthetic polycrystalline cuttersEASTMAN CHRISTENSEN CO·Filed 1986·Granted May 17, 1988·6 cites·16 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →