Patent US2440447A successfully refreshed from Google Patents.
Patent US2495376A successfully refreshed from Google Patents.
US2495376A
Expired / Lapsed
US
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Ventilating apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1946-06-29
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Granted: 1950-01-24
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Expires: 1966-06-29
Abstract
No abstract record available.
Inventors
- 👤 Eldon H Lusk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:38
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/52; B66C13/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE498449C
Cited
GB190519838A
Cited
US2204401A
Cited
US2268530A
Cited
US2251230A
Cited
US2348455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |