US2896715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cements
Assignee: Phillips Petroleum Co
•
Filing: 1952-05-05
•
Granted: 1959-07-28
•
Expires: 1972-05-05
Abstract
No abstract record available.
Inventors
- 👤 Rufus V Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:00
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C04; C04B; C04B24/00; C04B24/16; C04B24/161; C04B24/168; C04B24/24; C04B24/38; C04B24/383; C04B28/00; C04B28/02; C04B28/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN THE METHOD OF CEMENTING A CASING IN A WELL WHICH COMPRISES PUMPING DOWN THROUGH THE CASING AND UPWARDLY IN THE ANNULAR SPACE BETWEEN THE CASING AND THE BOREHOLE AN AQUEOUS HYDRAULIC CEMENT SLURRY, THE STEP OF ADDING TO THE CEMENT SLURRY A HYDRAULIC CEMENT THICKENING TIME EXTENDING AGENT SELECTED FROM THE GROUP CONSISTING OF ACID STARCH SULFATE AND SALTS OF ACID STARCH SULFATE.
Claim 2
Dependent Claim
64 words
IN THE METHOD OF CEMENTING A CASING IN A WELL WHICH COMPRISES PUMPING DOWN THROUGH THE CASING AND UPWARDLY IN THE ANNULAR SPACE BETWEEN THE CASING AND THE BOREHOLE AN AQUEOUS HYDRAULIC CEMENT SLURRY, THE STEP OF ADDING TO THE CEMENT SLURRY A HYDRAULIC CEMENT THICKENING TIME EXTENDING AGENT SELECTED FROM THE GROUP CONSISTING OF ACID STARCH SULFATE AND SALTS OF ACID STARCH SULFATE.
References Cited (Backward Citations)
US1607472A
Cited
US2374628A
Cited
US2417235A
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US2417307A
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US2429211A
Cited
US2399986A
Cited
US2662827A
Cited
US2576955A
Cited
US2489793A
Cited
US2561418A
Cited
US2562148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |