Patent US2604758A successfully refreshed from Google Patents.
US2604758A
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US
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Flowable weighted diaphragm air compressor
Assignee: Wingfoot Corp
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Filing: 1948-06-25
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Granted: 1952-07-29
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Expires: 1968-06-25
Abstract
No abstract record available.
Inventors
- 👤 Albert E Swindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:21
CPC Classifications
F; F04; F04B; F04B45/00; F04B45/02; F04B45/022; F04B45/033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |