US2838413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica gel flatting agent, method of preparing same, and composition containing same
Assignee: WR Grace and Co
•
Filing: 1954-05-27
•
Granted: 1958-06-10
•
Expires: 1974-05-27
Abstract
No abstract record available.
Inventors
- 👤 Luther O Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:37
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C01; C01B; C01B33/00; C01B33/113; C09C3/00; C09C3/04; C09C3/041; C09C3/08; C09D; C09D7/00; C09D7/40; C09D7/42; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
28 words
A COMPOSITION CONSISTING OF 85 TO 70 PARTS BY WEIGHT OF FINELY DIVIDED SILICA GEL IMPREGNATED WITH ABOUT 15 TO 30 PARTS BY WEIGHT OF MICROCRYSTALLINE PETROLEUM WAX.
References Cited (Backward Citations)
US525292A
Cited
US1755496A
Cited
US2141575A
Cited
US2204981A
Cited
US2433833A
Cited
US2475253A
Cited
US2597871A
Cited
US2642230A
Cited
US2559398A
Cited
US2649382A
Cited
US2666803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |