US3272749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud and additive therefor
Assignee: Alco Chemical Corp
•
Filing: 1965-03-31
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Granted: 1966-09-13
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Expires: 1985-03-31
Abstract
No abstract record available.
Inventors
- 👤 Robert A Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:13
CPC Classifications
C; C08; C08F; C08F261/00; C08F261/02; C08F261/04; C08F8/00; C08F8/12; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
AN IMPROVED AQUEOUS DRILLING FULID COMPRISING WATER, PARTICULATE SOLID MATERIAL WHICH FORMS A FILTER CAKE ON THE WALL OF A WELL, AND A WATER-SOLUBLE GRAFT POLYMER COMPRISING A LINEAR CHAIN OF VINYL ALCOHOL UNITS OF THE FORMULA:
Claim 2
Dependent Claim
37 words
AN IMPROVED AQUEOUS DRILLING FULID COMPRISING WATER, PARTICULATE SOLID MATERIAL WHICH FORMS A FILTER CAKE ON THE WALL OF A WELL, AND A WATER-SOLUBLE GRAFT POLYMER COMPRISING A LINEAR CHAIN OF VINYL ALCOHOL UNITS OF THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |