Patent US2539104A successfully refreshed from Google Patents.
US2539104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forehead lamps, particularly for medical purposes
Assignee: Individual
•
Filing: 1946-07-31
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Granted: 1951-01-23
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Expires: 1966-07-31
Abstract
No abstract record available.
Inventors
- 👤 Rodel Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:43
CPC Classifications
F; F21; F21L; F21L14/00; F21W; F21W2131/00; F21W2131/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US738887A
Cited
US1217666A
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US1632851A
Cited
US1650563A
Cited
US1705465A
Cited
US2088735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |