US2540577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental operating lamp
Assignee: Wilmot Castle Co
•
Filing: 1946-10-22
•
Granted: 1951-02-06
•
Expires: 1966-10-22
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Greppin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:49
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/24; F; F21; F21W; F21W2131/00; F21W2131/20; F21W2131/202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1393027A
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US1740609A
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US1917292A
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US1937585A
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US2065164A
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US1963278A
Cited
GB479722A
Cited
US2226300A
Cited
US2297781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |