US3129610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-ratio transmission mechanisms for vehicles
Assignee: David Brown Tractors Ltd
•
Filing: 1961-03-20
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Granted: 1964-04-21
•
Expires: 1981-03-20
Abstract
No abstract record available.
Inventors
- 👤 Ashfield Herbert Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0262; F16H2718/00; F16H2718/08; F16H2718/10; F16H2718/14; Y; Y10; Y10S; Y10S74/00; Y10S74/01; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A VEHICLE TRANSMISSION MECHANISM, MULTI-RATIO GEAR TRANSMISSION MEANS COMPRISING A PLURALITY OF GEAR REDUCTION SETS CONNECTED TOGETHER IN SERIES AND HAVING AN OUTPUT MEMBER DRIVEN THEREBY AND CONNECTED TO DRIVE MEANS FOR THE VEHICLE WHEELS, AND HYDRAULIC MECHANISM OPERATIVE TO EFFECT CHANGES OF GEAR RATIO IN SAID TRANSMISSION MEANS ONLY IN RESPONSE TO CHANGES OF SPEED OF SAID OUTPUT MEMBER, SAID HYDRAULIC MECHANISM COMPRISING CLUTCH MEANS FOR RENDERING INDIVIDUAL REDUCTION SETS INOPERATIVE, FLUID PRESSURE RESPONSIVE MEANS FOR ACTUATING SAID CLUTCH MEANS, MEANS INCLUDING A PUMP FOR SUPPLYING FLUID UNDER PRESSURE TO SAID FLUID PRESSURE RESPONSIVE MEANS FOR ACTUATING SAID CLUTCH MEANS, MEANS INCLUDING
Claim 2
Dependent Claim
104 words
IN A VEHICLE TRANSMISSION MECHANISM, MULTI-RATIO GEAR TRANSMISSION MEANS COMPRISING A PLURALITY OF GEAR REDUCTION SETS CONNECTED TOGETHER IN SERIES AND HAVING AN OUTPUT MEMBER DRIVEN THEREBY AND CONNECTED TO DRIVE MEANS FOR THE VEHICLE WHEELS, AND HYDRAULIC MECHANISM OPERATIVE TO EFFECT CHANGES OF GEAR RATIO IN SAID TRANSMISSION MEANS ONLY IN RESPONSE TO CHANGES OF SPEED OF SAID OUTPUT MEMBER, SAID HYDRAULIC MECHANISM COMPRISING CLUTCH MEANS FOR RENDERING INDIVIDUAL REDUCTION SETS INOPERATIVE, FLUID PRESSURE RESPONSIVE MEANS FOR ACTUATING SAID CLUTCH MEANS, MEANS INCLUDING A PUMP FOR SUPPLYING FLUID UNDER PRESSURE TO SAID FLUID PRESSURE RESPONSIVE MEANS FOR ACTUATING SAID CLUTCH MEANS, MEANS INCLUDING
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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) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |