US2844040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid displacement machine
Assignee: Individual
•
Filing: 1953-05-25
•
Granted: 1958-07-22
•
Expires: 1973-05-25
Abstract
No abstract record available.
Inventors
- 👤 Bancroft Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:54
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/222; F02B2075/1804; F02B2075/1816; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18272; Y10T74/21; Y10T74/2142; Y10T74/2143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1056746A
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US1585453A
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US1761429A
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US1787599A
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US1774105A
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GB341010A
Cited
US2088863A
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US2199625A
Cited
US2132595A
Cited
US2223100A
Cited
FR884403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |