Patent US2830455A successfully refreshed from Google Patents.
US2830455A
Expired / Lapsed
US
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Variable stroke pump
Assignee: Philadelphia Pump & Machinery
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Filing: 1955-12-06
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Granted: 1958-04-15
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Expires: 1975-12-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Harmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:56
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/04; F04B1/06; F04B1/07; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18176; Y10T74/18888; Y10T74/1892; Y10T74/18944
Claims Analysis
Total Claims: 0
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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) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |