Patent US3840460A successfully refreshed from Google Patents.
US3840460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricity additives for drilling fluids
Assignee: Atlantic Richfield Co
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Filing: 1972-08-31
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Granted: 1974-10-08
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Expires: 1992-08-31
Abstract
Abstract 1. A COMPOSITION USEFUL IN A DRILLING FLUID TO INCREASE THE LUBRICITY THEREOF, SAID COMPOSITION CONSISTING ESSENTIALLY OF AT LEAST ABOUT 40 WEIGHT PERCENT SULFURIZED LARD OIL, AT LEAST ABOUT 10 WEIGHT PERCENT MINERAL OIL, AND AT LEAST ABOUT 1 WEIGHT PERCENT HALOGENATED PARAFFIN, SAID COMPOSITION CONTAINING GREATER THAN 2 WEIGHT PERCENT TOTAL HALOGEN AND GREATER THAN 5 WEIGHT PERCENT TOTAL SULFUR.
Inventors
- 👤 D Sheldahl
- 👤 J Striegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:15
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A COMPOSITION USEFUL IN A DRILLING FLUID TO INCREASE THE LUBRICITY THEREOF, SAID COMPOSITION CONSISTING ESSENTIALLY OF AT LEAST ABOUT 40 WEIGHT PERCENT SULFURIZED LARD OIL, AT LEAST ABOUT 10 WEIGHT PERCENT MINERAL OIL, AND AT LEAST ABOUT 1 WEIGHT PERCENT HALOGENATED PARAFFIN, SAID COMPOSITION CONTAINING GREATER THAN 2 WEIGHT PERCENT TOTAL HALOGEN AND GREATER THAN 5 WEIGHT PERCENT TOTAL SULFUR.
Claim 2
Dependent Claim
61 words
A COMPOSITION USEFUL IN A DRILLING FLUID TO INCREASE THE LUBRICITY THEREOF, SAID COMPOSITION CONSISTING ESSENTIALLY OF AT LEAST ABOUT 40 WEIGHT PERCENT SULFURIZED LARD OIL, AT LEAST ABOUT 10 WEIGHT PERCENT MINERAL OIL, AND AT LEAST ABOUT 1 WEIGHT PERCENT HALOGENATED PARAFFIN, SAID COMPOSITION CONTAINING GREATER THAN 2 WEIGHT PERCENT TOTAL HALOGEN AND GREATER THAN 5 WEIGHT PERCENT TOTAL SULFUR.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |