US2280402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental operating lamp
Assignee: Wilmot Castle Co
•
Filing: 1939-08-10
•
Granted: 1942-04-21
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Expires: 1959-08-10
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Greppin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:39
CPC Classifications
F; F21; F21V; F21V11/00; F21V21/00; F21V21/14; F21V21/26; F21S; F21S8/00; F21S8/03; F21S8/033; F21S8/036; F21W; F21W2131/00; F21W2131/20; F21W2131/202; Y; Y10; Y10S; Y10S362/00; Y10S362/804
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) | 1945-04-20 | 1945-10-20 | 1946-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-04-20 | 1949-10-20 | 1950-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-04-20 | 1953-10-20 | 1954-04-21 | $7700.00 | Window Closed / Lapsed |