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US2487570A
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Ventilation system
Assignee: Westinghouse Electric Corp
•
Filing: 1946-01-18
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Granted: 1949-11-08
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Expires: 1966-01-18
Abstract
No abstract record available.
Inventors
- 👤 Martin Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:03
CPC Classifications
B; B08; B08B; B08B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US666859A
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US1138470A
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US1254725A
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US1539973A
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US2000637A
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US2073744A
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US2184484A
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US2262243A
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US2319703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |