US3208394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston pump having rolling diaphragm and pressure equalization means
Assignee: Bellofram Corp
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Filing: 1964-06-30
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Granted: 1965-09-28
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Expires: 1984-06-30
Abstract
No abstract record available.
Inventors
- 👤 John F Taplin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:29
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/04; F04B39/041; F04B39/044; F04B45/00; F04B45/02; F04B45/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A PISTON PUMP COMPRISING IN COMBINATION: (A) A CYLINDER BODY HAVING A SUCTION INLET AND A COMPRESSION OUTLET; (B) A RECIPROCATING PISTON INSIDE SAID CYLINDER BODY DEFINING A GAPBETWEEN THE RADIALLY INNER SURFACE OF SAID CYLINDER BODY AND THE RADIALLY OUTER SURFACE OF SAID PISTON; (C) A ROLLING DIAPHRAGM HAVING A RADIALLY OUTER PORTION SECURED TO SAID CYLINDER BODY, A RADIALLY INNER PORTION SECURED TO SAID PISTON AND A ROLLING WALL BETWEEN SAID RADIALLY OUTER PORTION AND SAID RADIALLY INNER PORTION ARRANGED INSIDE OF SAID GAP, SAID ROLLING DIAPHARGM SUBDIVIDING SAID CYLINDER BODY INTO A PUMP CHAMBER AN AN INACTIVE CHAMBER; (D) DUCT MEANS CONNECTING TO SAID INACTIVE CHAMBER A POINT OF SAID PUMP WHERE THE PRESSURE DROPS BELOW ATMOSPHERIC PRESSURE; AND (E) A CHECK VALVE ARRANGED IN SAID DUCT MEANS TO ALLOW FLUID FLOW FROM SAID INACTIVE CHAMBER TO SAID POINT OF SAID PUMP AND TO PRECLUDE FLUID FLOW FROM SAID POINT OF SAID PUMP TO SAID INACTIVE CHAMBER.
Claim 2
Dependent Claim
160 words
A PISTON PUMP COMPRISING IN COMBINATION: (A) A CYLINDER BODY HAVING A SUCTION INLET AND A COMPRESSION OUTLET; (B) A RECIPROCATING PISTON INSIDE SAID CYLINDER BODY DEFINING A GAPBETWEEN THE RADIALLY INNER SURFACE OF SAID CYLINDER BODY AND THE RADIALLY OUTER SURFACE OF SAID PISTON; (C) A ROLLING DIAPHRAGM HAVING A RADIALLY OUTER PORTION SECURED TO SAID CYLINDER BODY, A RADIALLY INNER PORTION SECURED TO SAID PISTON AND A ROLLING WALL BETWEEN SAID RADIALLY OUTER PORTION AND SAID RADIALLY INNER PORTION ARRANGED INSIDE OF SAID GAP, SAID ROLLING DIAPHARGM SUBDIVIDING SAID CYLINDER BODY INTO A PUMP CHAMBER AN AN INACTIVE CHAMBER; (D) DUCT MEANS CONNECTING TO SAID INACTIVE CHAMBER A POINT OF SAID PUMP WHERE THE PRESSURE DROPS BELOW ATMOSPHERIC PRESSURE; AND (E) A CHECK VALVE ARRANGED IN SAID DUCT MEANS TO ALLOW FLUID FLOW FROM SAID INACTIVE CHAMBER TO SAID POINT OF SAID PUMP AND TO PRECLUDE FLUID FLOW FROM SAID POINT OF SAID PUMP TO SAID INACTIVE CHAMBER.
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |