Patent US3321031A successfully refreshed from Google Patents.
US3321031A
Expired / Lapsed
US
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Earth working implement control apparatus
Assignee: International Motors LLC
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Filing: 1964-07-09
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Granted: 1967-05-23
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Expires: 1984-07-09
Abstract
No abstract record available.
Inventors
- 👤 Evans Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:38
CPC Classifications
A; A01; A01B; A01B61/00; A01B61/04; A01B61/044; A01B61/046; A01B35/00; A01B35/02; A01B35/04; A01B35/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
IN AN EARTH-WORKING IMPLEMENT HAVING A SUPPORTING FRAME AND A CONNECTION TO A TRACTIVE VEHICLE, AN EARTHPENETRATING TOOL MOUNTED ON THE FRAME FOR TRIPPING IN RESPONSE TO ABNORMAL DRAFT LOAD ON THE TOOL AND A CLOSED HYDRAULIC FLUID CIRCUIT CARRIED BY THE FRAME INCLUDING MEANS SERVING AS A SLAVE CYLINDER MOUNTED ON THE FRAME AND OPERATIVELY CONNECTED TO SAID TOOL SO AS TO PLACE THE FLUID IN SAID CYLINDER UNDER PRESSURE IN ONE DIRECTION WHEN DRAFT LOAD IS APPLIED TO THE TOOL, MEANS SERVING AS A MASTER CYLINDER IN SAID CIRCUIT HAVING A PISTON SLIDABLE THEREIN OPERATIVELY CONNECTED TO SAID VEHICLE IN DRAFT-RECEIVING RELATION TO PLACE THE FLUID IN SAID CIRCUIT UNDER PRESSURE
References Cited (Backward Citations)
US1398859A
Cited
US1808209A
Cited
US2074609A
Cited
US2379779A
Cited
FR988559A
Cited
US2572190A
Cited
US3172481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |