US2582459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for oil well cementing
Assignee: Standard Oil Development Co
•
Filing: 1948-11-03
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Granted: 1952-01-15
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Expires: 1968-11-03
Abstract
No abstract record available.
Inventors
- 👤 Richard A Salathiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:11
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
AN IMPROVED COMPOSITION SUITABLE FOR USE IN CEMENTING WELLS WHICH CONSISTS OF A PORTLAND CEMENT, AN AMOUNT OF A WATER-SOLUBLE SALT OF LIGNIN SULFONIC ACID IN THE RANGE BETWEEN 0.1 AND 1.0% BY WEIGHT OF DRY CEMENT, A COLLOIDAL CLAY IN AN AMOUNT IN THE RANGE BETWEEN 5% AND 35% BY WEIGHT OF DRY CEMENT AND WATER IN AN AMOUNT SUFFICIENT TO PROVIDE A PUMPABLE SLURRY.
Claim 2
Dependent Claim
66 words
AN IMPROVED COMPOSITION SUITABLE FOR USE IN CEMENTING WELLS WHICH CONSISTS OF A PORTLAND CEMENT, AN AMOUNT OF A WATER-SOLUBLE SALT OF LIGNIN SULFONIC ACID IN THE RANGE BETWEEN 0.1 AND 1.0% BY WEIGHT OF DRY CEMENT, A COLLOIDAL CLAY IN AN AMOUNT IN THE RANGE BETWEEN 5% AND 35% BY WEIGHT OF DRY CEMENT AND WATER IN AN AMOUNT SUFFICIENT TO PROVIDE A PUMPABLE SLURRY.
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) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |