US2801644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic safety device for incandescent lamp exhaust systems
Assignee: Westinghouse Electric Corp
•
Filing: 1953-04-28
•
Granted: 1957-08-06
•
Expires: 1973-04-28
Abstract
No abstract record available.
Inventors
- 👤 Glenn E Laswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
F; F04; F04C; F04C27/00; F04C27/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7293; Y10T137/7329; Y10T137/7358; Y10T137/7423; Y10T137/7426; Y10T137/7436
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1445811A
Cited
US1851084A
Cited
US1983891A
Cited
US2344304A
Cited
US2393078A
Cited
US2671527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |