US2740635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for producing variable sized apertures
Assignee: Individual
•
Filing: 1952-12-08
•
Granted: 1956-04-03
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Expires: 1972-12-08
Abstract
No abstract record available.
Inventors
- 👤 John M O'toole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:32
CPC Classifications
B; B23; B23P; B23P9/00; B23P9/02; B23B; B23B31/00; B23B31/02; B23B31/36; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17213; Y10T279/17231; Y10T279/17239; Y10T279/17247; Y10T279/18; Y10T409/00; Y10T409/30; Y10T409/303752
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) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |