Patent US3078187A successfully refreshed from Google Patents.
US3078187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry gelatinized starch product adapted for use in an oil well drilling fluid
Assignee: Cerestar USA Inc
•
Filing: 1958-10-29
•
Granted: 1963-02-19
•
Expires: 1978-10-29
Abstract
No abstract record available.
Inventors
- 👤 George T Bravos
- 👤 James W Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:50
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206; C08; C08B; C08B30/00; C08B30/12; C08B30/14; C09K8/03; C09K8/035
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
A DRIED GELANTINIZED STARCH COMPLEX WHICH CONTAINS BETWEEN ABOUT 0.1 TO 0.3% OF A WATER SOLUBLE ALKALINE EARTH METAL SALT BY WEIGHT OF STARCH SOLIDS WHICH WHEN SLURRIED IN ORDINARY WATER WILL INCREASE THE VISCOSITY OF THE SLURRY AND FROM A PASTE WHICH IS PREPARED BY HEATING STARCH GRANULES AT ELEVATED TEMPERATURE IN ORDINARY WATER CONTAINING ONLY SUCH WATER SOLUBLE ALKALINE EARTH METAL SALT AND ABOUT 10 TO 45% STARCH SOLIDS BY WEIGHT UNTIL SUBSTANTIALLY ALL THE STARCH GRANULES ARE PASTED AND WHEN DRYING THE SLURRY TO LESS THAN ABOUT 15% MOISTURE CONTENT BY WEIGHT OF STARCH AND THEREAFTER RECOVERING THE DRY STARCH PRODUCT.
References Cited (Backward Citations)
US2221552A
Cited
US2417307A
Cited
US2508533A
Cited
US2514055A
Cited
US2600404A
Cited
US2658035A
Cited
US2900335A
Cited
US2845367A
Cited
US2951776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |