US2657638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump
Assignee: Byron Jackson Co
•
Filing: 1948-04-12
•
Granted: 1953-11-03
•
Expires: 1968-04-12
Abstract
No abstract record available.
Inventors
- 👤 Charles L English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:46
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/348; F04C2/08; F04C2/10; F04C2/113; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972; Y10T74/19977; Y10T74/19981
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US929018A
Cited
CH96525A
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US1486835A
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US1970146A
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GB284411A
Cited
US1972565A
Cited
US1787543A
Cited
GB394423A
Cited
GB404424A
Cited
FR844907A
Cited
US2293369A
Cited
US2460018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |