US2939252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic lens generators
Assignee: American Optical Corp
•
Filing: 1957-02-04
•
Granted: 1960-06-07
•
Expires: 1977-02-04
Abstract
No abstract record available.
Inventors
- 👤 Cooke Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:10
CPC Classifications
B; B23; B23Q; B23Q11/00; B23Q11/08; B23Q11/085; B23Q1/00; B23Q1/25; B23Q1/44; B23Q1/50; B23Q1/54; B23Q1/5406; B23Q1/5412; B24; B24B; B24B1/00; B24B1/04; B24B13/00; B24B13/02; Y; Y10; Y10S; Y10S29/00; Y10S29/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2736144A
Cited
US1230530A
Cited
US2286361A
Cited
US2580716A
Cited
US2743649A
Cited
US2774193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |