Patent US3511779A successfully refreshed from Google Patents.
US3511779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buffered drilling mud additive
Assignee: MILCHEN Inc
•
Filing: 1968-03-14
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Granted: 1970-05-12
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Expires: 1988-03-14
Abstract
No abstract record available.
Inventors
- 👤 William C Browning
- 👤 Alphonse C Perricone
- 👤 Lida Lacy Edmundson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:55
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2109858A
Cited
US2357565A
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US2133759A
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US2205609A
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US2650194A
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US2999108A
Cited
US2935473A
Cited
US3009874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |