US2487749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four component optical objective
Assignee: WRAY (OPTICAL WORKS) Ltd
•
Filing: 1945-02-07
•
Granted: 1949-11-08
•
Expires: 1965-02-07
Abstract
No abstract record available.
Inventors
- 👤 Wynne Charles Gorrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:14
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US583336A
Cited
GB157040A
Cited
US2019985A
Cited
US2012822A
Cited
US2100290A
Cited
US2100291A
Cited
US2171640A
Cited
GB544658A
Cited
US2319171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |