US1596494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making porous siliceous objects
Assignee: Individual
•
Filing: 1925-12-14
•
Granted: 1926-08-17
•
Expires: 1945-12-14
Abstract
No abstract record available.
Inventors
- 👤 Fernando C Kern
- 👤 Frederick E Kern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:49
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/06; C04B38/063; Y; Y10; Y10S; Y10S264/00; Y10S264/63
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) | 1929-08-16 | 1930-02-15 | 1930-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-08-16 | 1934-02-15 | 1934-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-08-16 | 1938-02-15 | 1938-08-17 | $7700.00 | Window Closed / Lapsed |