US2532821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp
Assignee: Individual
•
Filing: 1947-02-17
•
Granted: 1950-12-05
•
Expires: 1967-02-17
Abstract
No abstract record available.
Inventors
- 👤 Rosenfeld Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:47
CPC Classifications
F; F21; F21V; F21V17/00; F21V17/02; F21S; F21S6/00; F21S6/002; F21V19/00; F21V19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US999813A
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US1096440A
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US1697037A
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US1665703A
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US1974077A
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US2264145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |