US3286990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system
Assignee: New York Air Brake LLC
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Filing: 1965-05-03
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Granted: 1966-11-22
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Expires: 1985-05-03
Abstract
No abstract record available.
Inventors
- 👤 Charles O Weisenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:31
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/47; B; B66; B66D; B66D1/00; B66D1/02; B66D1/08; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0133; Y; Y10; Y10S; Y10S254/00; Y10S254/90; Y10S60/00; Y10S60/905
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
A HYDROSTATIC TRANSMISSION COMPRISING (A) FIRST AND SECOND ROTARY HYDRAULIC MOTOR-PUMP UNITS, THE FIRST UNIT BEING OF THE OVERCENTER TYPE AND HAVING A DISPLACEMENT CONTROL ELEMENT MOVABLE BETWEEN MAXIMUM DISPLACEMENT POSITIONS AT OPPOSITE SIDES OF A ZERO DISPLACEMENT POSITION; (B) CONDUIT MEANS CONNECTING THE TWO UNITS IN A CLOSED TRANSMISSION CIRCUIT HAVING A HIGH PRESSURE SIDE AND A LOW PRESSURE SIDE; (C) REGULATING MEANS RESPONSIVE TO THE PRESSURE IN THE HIGH PRESSURE SIDE OF THE CIRCUIT AND ARRANGED TO POSITION THE DISPLACMENT CONTROL ELEMENT SO AS TO MAINTAIN SAID PRESSURE CONSTANT AT A PREDETERMINED VALUE WHEN THE FIRST UNIT IS EITHER DRIVING OR BEING DRIVEN BY THE SECOND UNIT; AND
References Cited (Backward Citations)
US2763467A
Cited
US3180090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |