US3257953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive displacement piston pump
Assignee: Individual
•
Filing: 1964-08-14
•
Granted: 1966-06-28
•
Expires: 1984-08-14
Abstract
No abstract record available.
Inventors
- 👤 Harry E Pinkerton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:13
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/164; F04B7/00; F04B7/04; F04B7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PUMP COMPRISING A CYLINDER HAVING A CYLINDER WALL DEFINING AN AXIAL BORE AND PISTON MOVABLE THEREIN, PORT MEANS FOR INTRODUCING INTO AND EXPELLING A LIQUID FROM SAID PUMP AND SCAVENGING MEANS INCORPORATED IN SAID PUMP FOR REDIRECTING ESCAPING LIQUID THAT ESCAPES BETWEEN THE ASSOCIATED WALLS OF THE PISTON AND CYLINDER, SAID SCAVENGING MEANS INCLUDING A GROOVE IN SAID CYLINDER WALL IN FIXED RELATIONSHIP TO SAID PORT MEANS AND ADAPTED TO COMMUNICATE WITH SAID PORT MEANS DURING THE MOVEMENT OF THE PISTON AND A SQUEEGEE MEANS FOR WIPING THE PISTON OF LIQUID IN ORDER THAT THIS LIQUID MAY BE DIRECTED THROUGH THE GROOVE TO THE PORT MEANS.
Claim 2
Dependent Claim
107 words
A PUMP COMPRISING A CYLINDER HAVING A CYLINDER WALL DEFINING AN AXIAL BORE AND PISTON MOVABLE THEREIN, PORT MEANS FOR INTRODUCING INTO AND EXPELLING A LIQUID FROM SAID PUMP AND SCAVENGING MEANS INCORPORATED IN SAID PUMP FOR REDIRECTING ESCAPING LIQUID THAT ESCAPES BETWEEN THE ASSOCIATED WALLS OF THE PISTON AND CYLINDER, SAID SCAVENGING MEANS INCLUDING A GROOVE IN SAID CYLINDER WALL IN FIXED RELATIONSHIP TO SAID PORT MEANS AND ADAPTED TO COMMUNICATE WITH SAID PORT MEANS DURING THE MOVEMENT OF THE PISTON AND A SQUEEGEE MEANS FOR WIPING THE PISTON OF LIQUID IN ORDER THAT THIS LIQUID MAY BE DIRECTED THROUGH THE GROOVE TO THE PORT MEANS.
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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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |