Barthel; Horst K. F.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Barthel; Horst K. F..The latest application filed is for "viscosifier for oil base drilling fluids".
- Barthel; Horst K. F. - Suessen DE
- Barthel; Horst K. F. - Hamburg DT
| Patent | Date |
|---|---|
| Viscosifier for oil base drilling fluids Grant 4,481,121 - Barthel November 6, 1 | 1984-11-06 |
| Drilling mud-cement compositions for well cementing operations Grant 3,887,009 - Miller , et al. June 3, 1 | 1975-06-03 |
| Clay-free aqueous sea water drilling fluids containing magnesium oxide or calcium oxide as an additive Grant 3,878,110 - Miller , et al. April 15, 1 | 1975-04-15 |
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