US2451932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable perimeter target
Assignee: American Optical Corp
•
Filing: 1945-06-04
•
Granted: 1948-10-19
•
Expires: 1965-06-04
Abstract
No abstract record available.
Inventors
- 👤 Charles A Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:01
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US123218A
Cited
US1057932A
Cited
US1414173A
Cited
US1468579A
Cited
US2079112A
Cited
US2316042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |