Patent US5596604A successfully refreshed from Google Patents.
Patent US3255704A successfully refreshed from Google Patents.
US3255704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump
Assignee: New York Air Brake LLC
•
Filing: 1965-02-24
•
Granted: 1966-06-14
•
Expires: 1985-02-24
Abstract
No abstract record available.
Inventors
- 👤 Joseph N Mazur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:14
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/3446
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
IN A VANE PUMP INCLUDING A ROTOR FORMED WITH A PLURALITY OF CIRCUMFERENTIALLY SPACED VANES SLOTS THAT CONTAIN SLIDING VANES OF THE DUAL LEAF TYPE; A CAM RING ENCIRCLING THE ROTOR AND SHAPED TO ALLOW THE VANES TO MOVE OUTWARD DURING A FIRST PORTION OF A REVOLUTION OF THE ROTOR, TO MOVE THE VANES INWARD DURING A SECOND PORTION OF A REVOLUTION, AND TO ALLOW THE VANES TO ASSUME A RADIALLY STABLE POSITION DURING A THIRD PORTION OF A REVOLUTION INTERMEDIATE THE FIRST AND SECOND PORTIONS; CIRCUMFERENTIALLY SPACED INLET AND DISCHARGE PORTS COMMUNICATING WITH THE INTERVANE WORKING SPACES AS THE VANES MOVE OUTWARD AND INWARD, RESPECTIVELY; MEANS FOR SUBJECTING THE INNER ENDS OF THE VANES TO A LOW PRESSURE DURING SAID FIRST PORTION OF A REVOLUTION; AND MEANS FOR SUBJECTING THE INNER ENDS OF THE VANES TO AN ELEVATED PRESSURE DURING SAID SECOND AND THIRD PORTIONS OF A REVOLUTION; THE IMPROVEMENT WHICH COMPRISES MEANS FOR CLAMPING EACH VANE AGAINST A WALL OF ITS VANE SLOT AS IT LEAVES THE REGION OF THE INLET PORT AND BEFORE ITS INNER END IS SUBJECTED TO AN ELEVATED PRESSURE.
Claim 2
Dependent Claim
185 words
IN A VANE PUMP INCLUDING A ROTOR FORMED WITH A PLURALITY OF CIRCUMFERENTIALLY SPACED VANES SLOTS THAT CONTAIN SLIDING VANES OF THE DUAL LEAF TYPE; A CAM RING ENCIRCLING THE ROTOR AND SHAPED TO ALLOW THE VANES TO MOVE OUTWARD DURING A FIRST PORTION OF A REVOLUTION OF THE ROTOR, TO MOVE THE VANES INWARD DURING A SECOND PORTION OF A REVOLUTION, AND TO ALLOW THE VANES TO ASSUME A RADIALLY STABLE POSITION DURING A THIRD PORTION OF A REVOLUTION INTERMEDIATE THE FIRST AND SECOND PORTIONS; CIRCUMFERENTIALLY SPACED INLET AND DISCHARGE PORTS COMMUNICATING WITH THE INTERVANE WORKING SPACES AS THE VANES MOVE OUTWARD AND INWARD, RESPECTIVELY; MEANS FOR SUBJECTING THE INNER ENDS OF THE VANES TO A LOW PRESSURE DURING SAID FIRST PORTION OF A REVOLUTION; AND MEANS FOR SUBJECTING THE INNER ENDS OF THE VANES TO AN ELEVATED PRESSURE DURING SAID SECOND AND THIRD PORTIONS OF A REVOLUTION; THE IMPROVEMENT WHICH COMPRISES MEANS FOR CLAMPING EACH VANE AGAINST A WALL OF ITS VANE SLOT AS IT LEAVES THE REGION OF THE INLET PORT AND BEFORE ITS INNER END IS SUBJECTED TO AN ELEVATED PRESSURE.
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |