US3073254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure balanced pump
Assignee: RTX Corp
•
Filing: 1959-12-24
•
Granted: 1963-01-15
•
Expires: 1979-12-24
Abstract
No abstract record available.
Inventors
- 👤 John C Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:35
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/20; F04B1/2014; F04B1/2078; F04B1/2085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN A MULTIPLE PISTON PUMP HAVING AT LEAST ONE PUMPING CHAMBER, A PISTON IN SAID CHAMBER, A PISTON ROD EXTENSION FOR SAID PISTON, PLATE MEANS AT THE ANTIPUMPING END OF SAID PISTON ROD, A BEARING SURFACE ADJACENT SAID PLATE MEANS AND RECEIVING THE REACTION FROM SAID PLATE MEANS, PRESSURE-BALANCING MEANS COMPRISING A SECOND CHAMBER BETWEEN THE ADJACENT FACES OF SAID PLATE MEANS AND SAID BEARING, SAID SECOND CHAMBER HAVING AN EFFECTIVE AREA GREATER THAN SAID PUMPING CHAMBER, A FIRST PASSAGE MEANS PASSING THROUGH SAID ROD AND INCLUDING A FIXED AREA PRESSURE-REDUCING ORIFICE CONNECTED TO SAID PUMPING CHAMBER AND FURTHER COMMUNICATING WITH SAID SECOND CHAMBER, SAID ORIFICE BEING FORMED BETWEEN THE WALL OF SAID PUMP-
Claim 2
Dependent Claim
114 words
IN A MULTIPLE PISTON PUMP HAVING AT LEAST ONE PUMPING CHAMBER, A PISTON IN SAID CHAMBER, A PISTON ROD EXTENSION FOR SAID PISTON, PLATE MEANS AT THE ANTIPUMPING END OF SAID PISTON ROD, A BEARING SURFACE ADJACENT SAID PLATE MEANS AND RECEIVING THE REACTION FROM SAID PLATE MEANS, PRESSURE-BALANCING MEANS COMPRISING A SECOND CHAMBER BETWEEN THE ADJACENT FACES OF SAID PLATE MEANS AND SAID BEARING, SAID SECOND CHAMBER HAVING AN EFFECTIVE AREA GREATER THAN SAID PUMPING CHAMBER, A FIRST PASSAGE MEANS PASSING THROUGH SAID ROD AND INCLUDING A FIXED AREA PRESSURE-REDUCING ORIFICE CONNECTED TO SAID PUMPING CHAMBER AND FURTHER COMMUNICATING WITH SAID SECOND CHAMBER, SAID ORIFICE BEING FORMED BETWEEN THE WALL OF SAID PUMP-
References Cited (Backward Citations)
US2733665A
Cited
US2241701A
Cited
GB640168A
Cited
US2834297A
Cited
US2901979A
Cited
FR1114641A
Cited
US2918012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |