US2874545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gels and process for making them
Assignee: L H Lincoln & Son Inc
•
Filing: 1954-03-02
•
Granted: 1959-02-24
•
Expires: 1974-03-02
Abstract
No abstract record available.
Inventors
- 👤 Twining Ralph Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0065; Y; Y10; Y10S; Y10S507/00; Y10S507/903; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A PROCESS FOR IMPREGNATION POROUS GROUND FORMATIONS WITH A WATER-INSOLUBLE GEL WHICH COMPRISES INTRODUCING INTO SUCH A FORMATION AN AQUEOUS SOLUTION HAVING A PH OF LESS THAN 7 CONTAINING CONIFEROUS SULFITE LIQUOR, AT LEAST ONE CHROMIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMATES AND DICHROMATED, AND BORIS ACID, SAID BORIC ACID BEING PRESENT IN EXCESS OF THE AMOUNT REQUIRED TO CONVERT ANY LIGNOSULFONATES PRESENT IN SAID SULFITE LIQUOR TO LIGNOSULFONIC ACIDS, AND SAID CHROMIUM CHROMIUM COMPOUND TO CHROMIC ACID, AND SAID CHROMIUM COMPOUND BEING PRESENT IN AN AMOUNT SUFFICIENT TO FROM A GEL WITH THE LIGNOSULFONIC ACIDS PRESENT AND FORMED IN SAID SULFITE LIQUOR.
References Cited (Backward Citations)
US1143714A
Cited
US1553220A
Cited
US2280600A
Cited
US2503297A
Cited
US2589252A
Cited
US2749090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |