Patent US2455480A successfully refreshed from Google Patents.
US2455480A
Expired / Lapsed
US
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Diaphragm pump
Assignee: DAPCO PRODUCTS Inc
•
Filing: 1944-11-06
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Granted: 1948-12-07
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Expires: 1964-11-06
Abstract
No abstract record available.
Inventors
- 👤 Harold F Hadley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:52
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/0009; F04B43/0036; F04B43/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2140600A
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US1895602A
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US1992491A
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US2148957A
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US2230595A
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US2260180A
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US2267280A
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US2298402A
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US2354958A
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US2368132A
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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) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |