US3799874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well cementing
Assignee: Atlantic Richfield Co
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Filing: 1973-03-16
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Granted: 1974-03-26
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Expires: 1993-03-16
Abstract
Abstract A SPACER COMPOSITION FOR USE WHILE CEMENTING A WELL THAT CONTAINS AN OIL BASE DRILLING FLUID, THE SPACER CONTAINING A WATER-IN-OIL EMULSION AND AT LEAST ONE OF AN INORGANIC AND ORGANIC MATERIAL SUCH AS HALIDES, BORATES, PHOSPHATES, AND THE LIKE.
Inventors
- 👤 P Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:51
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/424; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/928
Claims Analysis
Total Claims: 0
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |