US2491761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing silica fibers and fibrous articles produced thereby
Assignee: H I THOMPSON Co
•
Filing: 1946-05-11
•
Granted: 1949-12-20
•
Expires: 1966-05-11
Abstract
No abstract record available.
Inventors
- 👤 Parker Leon
- 👤 Cole Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:01
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/66; C03C25/68; C03C13/00; C03C13/005; C04; C04B; C04B26/00; C04B26/02; C04B30/00; C04B30/02; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T442/00; Y10T442/60; Y10T442/696
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US195889A
Cited
US1913242A
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US2184320A
Cited
US2261148A
Cited
US2407483A
Cited
US2331944A
Cited
US2315329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |