Patent US2077481A successfully refreshed from Google Patents.
US2077481A
Expired / Lapsed
US
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Transparent phosphate glass
Assignee: IG Farbenindustrie AG
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Filing: 1934-07-18
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Granted: 1937-04-20
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Expires: 1954-07-18
Abstract
No abstract record available.
Inventors
- 👤 Huppert Paul
- 👤 Wolff Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:02
CPC Classifications
F; F16; F16D; F16D11/00; F16D11/02; F16D11/06; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/12; C03C3/16; C03C3/17; C03C3/19; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905
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) | 1940-04-19 | 1940-10-19 | 1941-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-04-19 | 1944-10-19 | 1945-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-04-19 | 1948-10-19 | 1949-04-20 | $7700.00 | Window Closed / Lapsed |