Patent US2491237A successfully refreshed from Google Patents.
US2491237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of miniature lamps
Assignee: Westinghouse Electric Corp
•
Filing: 1947-05-17
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Granted: 1949-12-13
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Expires: 1967-05-17
Abstract
No abstract record available.
Inventors
- 👤 Donald F Way
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:53
CPC Classifications
H; H01; H01K; H01K3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US300523A
Cited
USRE19836E
Cited
US720762A
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US1373920A
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US1936094A
Cited
US2201694A
Cited
US2235515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |