Patent US2476711A successfully refreshed from Google Patents.
US2423162A
Expired / Lapsed
US
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Variable stroke hand pump
Assignee: HPM Development Corp
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Filing: 1943-07-05
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Granted: 1947-07-01
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Expires: 1963-07-05
Abstract
No abstract record available.
Inventors
- 👤 Otto M Summers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:54
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US635258A
Cited
US870630A
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FR455981A
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US1649356A
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US2070935A
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US2183436A
Cited
US2191552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |