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Patent US2507549A successfully refreshed from Google Patents.
US2507549A
Expired / Lapsed
US
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Servicing device for fluorescent lighting fixtures
Assignee: Individual
•
Filing: 1947-05-21
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Granted: 1950-05-16
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Expires: 1967-05-21
Abstract
No abstract record available.
Inventors
- 👤 Lee F Smith
- 👤 Herbert J Sandstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:08
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/003; H01J9/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1193685A
Cited
US2427842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |