Patent US2034141A successfully refreshed from Google Patents.
US3306408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically engaged clutch with dual spring means and modulating valve
Assignee: Deere and Co
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Filing: 1965-02-12
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Granted: 1967-02-28
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Expires: 1985-02-12
Abstract
No abstract record available.
Inventors
- 👤 Glenn W Kahle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:35
CPC Classifications
F; F16; F16D; F16D25/00; F16D25/06; F16D25/062; F16D25/063; F16D25/0635; F16D25/0638; F16D25/12; F16D25/14; F16D48/00; F16D48/02; F16D48/04; F16D2048/0209; F16D2048/0212; F16D2048/0221
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A HYDRAULICALLY ACTUATED FRICTION CLUTCH COMPRISING A DRIVE MEMBER, A DRIVEN MEMBER, A PLURALITY OF FRICTIONALLY ENGAGEABLE CLUTCH MEMBERS OPERABLY CONNECTED TO SAID DRIVE AND DRIVEN MEMBERS FOR DRIVING SAID MEMBERS IN UNISON WHEN ENGAGED, A HYDRAULIC MECHANISM FOR EFFECTING THE ENGAGEMENT OF SAID CLUTCH MEMBERS INCLUDING A FIXED AND A MOVALBY MEMBER, MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO SAID HYDRAULIC MECHANISM FOR MOVING SAID MOVABLE MEMBER INTO A CLUTCH ENGAGING POSITION, A FIRST SPRING MEANS ACTING ON THE MOVABLE MEMBER AND BIASING IT AWAY FROM A CLUTCH-ENGAGING POSITION, AN A SECOND SPRING MEANS ENGAGING SAID MOVABLE MEMBER ONLY AFTER SOME MOVEMENT TOWARD ITS CLUTCH-ENGAGING POSITION AT A PREDETERMINED DISTANCE FROM SAID ENGAGING POSITION TO FURNISH ADDITIONAL BIASING FORCE.
Claim 2
Dependent Claim
120 words
A HYDRAULICALLY ACTUATED FRICTION CLUTCH COMPRISING A DRIVE MEMBER, A DRIVEN MEMBER, A PLURALITY OF FRICTIONALLY ENGAGEABLE CLUTCH MEMBERS OPERABLY CONNECTED TO SAID DRIVE AND DRIVEN MEMBERS FOR DRIVING SAID MEMBERS IN UNISON WHEN ENGAGED, A HYDRAULIC MECHANISM FOR EFFECTING THE ENGAGEMENT OF SAID CLUTCH MEMBERS INCLUDING A FIXED AND A MOVALBY MEMBER, MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO SAID HYDRAULIC MECHANISM FOR MOVING SAID MOVABLE MEMBER INTO A CLUTCH ENGAGING POSITION, A FIRST SPRING MEANS ACTING ON THE MOVABLE MEMBER AND BIASING IT AWAY FROM A CLUTCH-ENGAGING POSITION, AN A SECOND SPRING MEANS ENGAGING SAID MOVABLE MEMBER ONLY AFTER SOME MOVEMENT TOWARD ITS CLUTCH-ENGAGING POSITION AT A PREDETERMINED DISTANCE FROM SAID ENGAGING POSITION TO FURNISH ADDITIONAL BIASING FORCE.
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |