US2640227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lenses from transparent plastics
Assignee: Combined Optical Industries Ltd
•
Filing: 1950-01-17
•
Granted: 1953-06-02
•
Expires: 1970-01-17
Abstract
No abstract record available.
Inventors
- 👤 Johnson John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:32
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00865
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US309914A
Cited
GB482836A
Cited
US2322310A
Cited
US2339433A
Cited
US2397231A
Cited
US2432668A
Cited
US2481809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |