Inventor · disambiguated record
Charles F. Kirkvold
Also filed as: KIRKVOLD CHARLES F
5 granted patents·1,087 citations·filing 1975–1976
88Inventor score
Technology areasE21B
Files withCHEVRON RES5
Top patents by PatentIndex Score
5 records- 0196US4019575ASystem for recovering viscous petroleum from thick tar sandCHEVRON RES·Filed 1975·Granted Apr 26, 1977·326 cites·3 claims
- 0296US3994340AMethod of recovering viscous petroleum from tar sandCHEVRON RES·Filed 1975·Granted Nov 30, 1976·316 cites·16 claims
- 0394US3994341ARecovering viscous petroleum from thick tar sandCHEVRON RES·Filed 1975·Granted Nov 30, 1976·289 cites·11 claims
- 0492US4020901AArrangement for recovering viscous petroleum from thick tar sandCHEVRON RES·Filed 1976·Granted May 3, 1977·109 cites·4 claims
- 0579US4008765AMethod of recovering viscous petroleum from thick tar sandCHEVRON RES·Filed 1975·Granted Feb 22, 1977·47 cites·5 claims
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