US3484157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion-resistant optical element
Assignee: American Optical Corp
•
Filing: 1965-10-23
•
Granted: 1969-12-16
•
Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Harry D Crandon
- 👤 Ronald B Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:17
CPC Classifications
G02B1/105; G; G02; G02B; G02B1/00; G02B1/10; G02B1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2320533A
Cited
US2423583A
Cited
US2387831A
Cited
US3221083A
Cited
US3282729A
Cited
US3294577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |