US2479935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming coated optical elements from polymerizable materials
Assignee: Combined Optical Industries Ltd
•
Filing: 1947-03-13
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Granted: 1949-08-23
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Expires: 1967-03-13
Abstract
No abstract record available.
Inventors
- 👤 Johnson John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:05
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00865; B29D11/00894; B29D11/00913; B29D11/00009; B29C; B29C67/00; B29C67/24; B29C67/246; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US939966A
Cited
US1094828A
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US2063315A
Cited
US2241415A
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US2322310A
Cited
US2397231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |