US2844480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cement compositions for wells
Assignee: Dow Chemical Co
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Filing: 1956-05-31
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Granted: 1958-07-22
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Expires: 1976-05-31
Abstract
No abstract record available.
Inventors
- 👤 Jr George K Greminger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:45
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A CEMENT COMPOSITION USEFUL IN THE FORM OF A PUMPABLE AQUEOUS SLURRY FOR CEMENTING EARTHEN WELLS AND WHICH EXHIBITS A LOW WATER LOSS AND A RETARDED TIME TO REACH AN UNPUMPABLE SET CONSISTING ESSENTIALLY OF A HYDRAULIC CEMENT AND FROM ABOUT 0.3 TO ABOUT 1.0 PERCENT BY WEIGHT OF SAID CEMENTITIOUS MATERIAL OF A WATERSOLUBLE CARBOXYMETHYL METHYL CELLULOSE.
Claim 2
Dependent Claim
58 words
A CEMENT COMPOSITION USEFUL IN THE FORM OF A PUMPABLE AQUEOUS SLURRY FOR CEMENTING EARTHEN WELLS AND WHICH EXHIBITS A LOW WATER LOSS AND A RETARDED TIME TO REACH AN UNPUMPABLE SET CONSISTING ESSENTIALLY OF A HYDRAULIC CEMENT AND FROM ABOUT 0.3 TO ABOUT 1.0 PERCENT BY WEIGHT OF SAID CEMENTITIOUS MATERIAL OF A WATERSOLUBLE CARBOXYMETHYL METHYL CELLULOSE.
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) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |