Patent US3664770A successfully refreshed from Google Patents.
US3664770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm pumps
Assignee: Golden Arrow Manufacturing Ltd
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Filing: 1970-02-18
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Granted: 1972-05-23
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Expires: 1990-02-18
Abstract
Abstract A METALLIC HOUSING CONTAINS A DIAPHRAGM AND A BACKING PLATE OF PLASTIC MATERIAL, THE PLATE HAVING AN ANNULAR FLANGE IN ABUTMENT WITH THE DIAPHRAGM SO AS TO FORM A PUMPING CHAMBER. INLET AND OUTLET VALVES ARE CONTAINED IN PLASTIC SLEEVES IN THE HOUSING, THE SLEEVES COMMUNICATING WITH THE PUMPING CHAMBER AND BEING SEALINGLY FITTED IN OPENINGS IN THE BACKING PLATE. THUS, ABRASIVE OR CORROSIVE LIQUID PUMPED THROUGH THE VALVES AND CHAMBER IS PREVENTED BY THE PLASTIC COMPONENTS FROM CONTACTING THE METALLIC HOUSING.
Inventors
- 👤 Harry E Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:00
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B53/00; F04B53/10; F04B53/102; F04B53/1032
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |