US3214911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic apparatus
Assignee: Dowty Hydraulic Units Ltd
•
Filing: 1964-06-01
•
Granted: 1965-11-02
•
Expires: 1984-06-01
Abstract
No abstract record available.
Inventors
- 👤 Bertram C Kempson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:36
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/10; B60W10/101; B60W10/103; B60W10/04; B60W10/06; B60W30/00; B60W30/18; B60W30/188; F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/462; F16H59/00; F16H59/68; F16H2059/6838; F16H2059/6861
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN COMBINATION WITH AN INFINITELY VARIABLE SPEED RATIO HYDROSTATIC POWER TRANSMISSION COMPRISING A POSITIVE DISPLACEMENT HYDRAULIC TRANSMISSION PUMP IN HYDRAULIC CONNECTION WITH A POSITIVE DISPLACEMENT HYDRAULIC TRANSMISSION MOTOR IN WHICH AT LEAST ONE OF THE DISPLACEMENT OF THE PUMP AND THE MOTOR IS VARIABLE TO VARY THE SPEED RATIO BETWEEN THE TRANSMISSION PUMP AND THE TRANSMISSION MOTOR; A FIXED DISPLACEMENT HYDRAULIC PUMP MECHANICALLY DRIVEN IN A FIXED SPEED RELATION WITH THE TRANSMISSION PUMP, A VARIABLE THROTTLE THROUGH WHICH DELIVERY OF THE FIXED DISPLACEMENT PUMP IS ARRANGED TO PASS, PRESSURE RESPONSIVE MEANS TO ADJUST THE THROTTLE IN ACCORDANCE WITH HYDRAULIC PRESSURE GENERATED BY THE TRANSMISSION PUMP, AND SPEED RATIO ADJUSTING MEANS FOR THE TRANSMISSION OPERABLE TO SELECT A SPEED RATIO IN ACCORDANCE WITH PRESSURE DROP
Claim 2
Dependent Claim
124 words
IN COMBINATION WITH AN INFINITELY VARIABLE SPEED RATIO HYDROSTATIC POWER TRANSMISSION COMPRISING A POSITIVE DISPLACEMENT HYDRAULIC TRANSMISSION PUMP IN HYDRAULIC CONNECTION WITH A POSITIVE DISPLACEMENT HYDRAULIC TRANSMISSION MOTOR IN WHICH AT LEAST ONE OF THE DISPLACEMENT OF THE PUMP AND THE MOTOR IS VARIABLE TO VARY THE SPEED RATIO BETWEEN THE TRANSMISSION PUMP AND THE TRANSMISSION MOTOR; A FIXED DISPLACEMENT HYDRAULIC PUMP MECHANICALLY DRIVEN IN A FIXED SPEED RELATION WITH THE TRANSMISSION PUMP, A VARIABLE THROTTLE THROUGH WHICH DELIVERY OF THE FIXED DISPLACEMENT PUMP IS ARRANGED TO PASS, PRESSURE RESPONSIVE MEANS TO ADJUST THE THROTTLE IN ACCORDANCE WITH HYDRAULIC PRESSURE GENERATED BY THE TRANSMISSION PUMP, AND SPEED RATIO ADJUSTING MEANS FOR THE TRANSMISSION OPERABLE TO SELECT A SPEED RATIO IN ACCORDANCE WITH PRESSURE DROP
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |