US2421057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable reflector
Assignee: AMERICAN DISPLAY Co
•
Filing: 1945-05-30
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Granted: 1947-05-27
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Expires: 1965-05-30
Abstract
No abstract record available.
Inventors
- 👤 Milton S Dunkelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:01
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/0066; F21V17/00; F21V17/02; F21V17/06; F21V17/10; F21V17/107; F21V15/00; F21V15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |