US2621132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement composition
Assignee: Shell Development Co
•
Filing: 1949-03-22
•
Granted: 1952-12-09
•
Expires: 1969-03-22
Abstract
No abstract record available.
Inventors
- 👤 Saal Reyerus Nicolaas Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:28
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/08; C04B24/00; C04B24/24; C04B24/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A FLUID CEMENT SLURRY HAVING A RETARDED SETTING ACTION FOR USE IN WELL CEMENTING OPERATIONS AT TEMPERATURES OVER ATMOSPHERIC, SAID CEMENT COMPRISING A HYDRAULIC CEMENT HAVING ADMIXED THEREWITH FROM 0.2 TO 2.5% OF A GASOLINE INSOLUBLE HIGH MOLECULAR WEIGHT OF OXIDIZED PARAFFIN WAX.
Claim 2
Dependent Claim
43 words
A FLUID CEMENT SLURRY HAVING A RETARDED SETTING ACTION FOR USE IN WELL CEMENTING OPERATIONS AT TEMPERATURES OVER ATMOSPHERIC, SAID CEMENT COMPRISING A HYDRAULIC CEMENT HAVING ADMIXED THEREWITH FROM 0.2 TO 2.5% OF A GASOLINE INSOLUBLE HIGH MOLECULAR WEIGHT OF OXIDIZED PARAFFIN WAX.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |