Inventor · disambiguated record
John A. Duke
Also filed as: DUKE JOHN A
5 granted patents·175 citations·filing 1976–1996
84Inventor score
Technology areasE21B
Top patents by PatentIndex Score
5 records- 0181US4164980AWell cementing method and apparatusDUKE JOHN A·Filed 1978·Granted Aug 21, 1979·56 cites·6 claims
- 0270US4047566AWell cementing method and apparatusDUKE JOHN A·Filed 1976·Granted Sep 13, 1977·37 cites·10 claims
- 0359US5769166AWellbore window milling methodWEATHERFORD LAMB·Filed 1996·Granted Jun 23, 1998·34 cites·16 claims
- 0456US4384624AEarth boring headDUKE JOHN W·Filed 1981·Granted May 24, 1983·27 cites·11 claims
- 0547US4306626AHydraulic earth boring machineDUKE JOHN W·Filed 1980·Granted Dec 22, 1981·21 cites·22 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →