Patent US2458256A successfully refreshed from Google Patents.
US2406580A
Expired / Lapsed
US
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Optical glasses
Assignee: Chance Brothers Ltd
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Filing: 1945-01-02
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Granted: 1946-08-27
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Expires: 1965-01-02
Abstract
No abstract record available.
Inventors
- 👤 Bastick Raymond Edward
- 👤 Hampton Wilfred Marsh
- 👤 Wang Ta-Hang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:07
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C3/07; C03C3/072; C03C3/074; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
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) | 1949-08-26 | 1950-02-25 | 1950-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-08-26 | 1954-02-25 | 1954-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-08-26 | 1958-02-25 | 1958-08-27 | $7700.00 | Window Closed / Lapsed |