Patent US2477003A successfully refreshed from Google Patents.
US2477003A
Expired / Lapsed
US
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Rotary helical gear air pump with discharge pressure regulator
Assignee: Joy Manufacturing Co
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Filing: 1942-09-17
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Granted: 1949-07-26
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Expires: 1962-09-17
Abstract
No abstract record available.
Inventors
- 👤 Paget Win Withers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:03
CPC Classifications
F; F04; F04C; F04C28/00; F04C28/10; F04C28/16; F04C18/00; F04C18/08; F04C18/12; F04C18/14; F04C18/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1111498A
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US1177898A
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US1669050A
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GB384355A
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US2044867A
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US2111568A
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US2174522A
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US2358815A
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US2217364A
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US2307251A
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US2316416A
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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) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |