US1886649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of fused bifocal lenses
Assignee: UK Optical Co Ltd
•
Filing: 1930-05-23
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Granted: 1932-11-08
•
Expires: 1950-05-23
Abstract
No abstract record available.
Inventors
- 👤 Culver Edward
- 👤 Emerson Alfred Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:11
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/22
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) | 1935-11-08 | 1936-05-09 | 1936-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-11-08 | 1940-05-09 | 1940-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-11-08 | 1944-05-09 | 1944-11-08 | $7700.00 | Window Closed / Lapsed |