US1900859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making gels
Assignee: Silica Gel Corp
•
Filing: 1930-07-25
•
Granted: 1933-03-07
•
Expires: 1950-07-25
Abstract
No abstract record available.
Inventors
- 👤 Gerald C Connolly
- 👤 Ernest B Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:30
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-03-06 | 1936-09-05 | 1937-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-03-06 | 1940-09-05 | 1941-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-03-06 | 1944-09-05 | 1945-03-07 | $7700.00 | Window Closed / Lapsed |