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US2338463A
Expired / Lapsed
US
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Process of making filaments consisting of pure silicic acid
Assignee: Individual
•
Filing: 1938-08-18
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Granted: 1944-01-04
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Expires: 1958-08-18
Abstract
No abstract record available.
Inventors
- 👤 Skaupy Franz
- 👤 Weissenberg Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03C; C03C13/00; C03C13/005; C03C13/006; Y; Y10; Y10S; Y10S264/00; Y10S264/19
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) | 1947-01-03 | 1947-07-05 | 1948-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-01-03 | 1951-07-05 | 1952-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-01-03 | 1955-07-05 | 1956-01-04 | $7700.00 | Window Closed / Lapsed |