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US2914660A
Expired / Lapsed
US
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Illuminators
Assignee: American Optical Corp
•
Filing: 1957-06-12
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Granted: 1959-11-24
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Expires: 1977-06-12
Abstract
No abstract record available.
Inventors
- 👤 Norman A Wrigglesworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:09
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1262517A
Cited
US1153161A
Cited
US1256522A
Cited
US1527823A
Cited
US2076240A
Cited
US2587956A
Cited
US2739228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |