Patent US2491678A successfully refreshed from Google Patents.
US2491678A
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Rotary blower with abrading casing end walls and abradable rotor end plates
Assignee: Borg Warner Corp
•
Filing: 1943-12-09
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Granted: 1949-12-20
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Expires: 1963-12-09
Abstract
No abstract record available.
Inventors
- 👤 Robert P Mcculloch
- 👤 John L Ryde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:53
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/10; F01C21/104; F01C21/108; F04; F04C; F04C18/00; F04C18/08; F04C18/082; F04C18/086; F04C18/12; F04C18/123; Y; Y10; Y10T; Y10T29/00; Y10T29/46; Y10T29/49; Y10T29/49316; Y10T29/49329
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US664480A
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US930907A
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US1032342A
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US1002176A
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US1631359A
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US1746885A
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GB464475A
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CH207907A
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US2259027A
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US2288164A
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US2337903A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |