US2439796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping mechanism
Assignee: Walker Manufacturing Co
•
Filing: 1944-04-06
•
Granted: 1948-04-20
•
Expires: 1964-04-06
Abstract
No abstract record available.
Inventors
- 👤 Irwin E Dearsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:08
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/14; B; B66; B66F; B66F5/00; B66F5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US867932A
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US2255984A
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US2311468A
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US2254084A
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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) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |