Patent US3101977A successfully refreshed from Google Patents.
US3101977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic track tensioning means
Assignee: LeTourneau Westinghouse Co
•
Filing: 1960-10-25
•
Granted: 1963-08-27
•
Expires: 1980-10-25
Abstract
No abstract record available.
Inventors
- 👤 John H Hyler
- 👤 Ernst W Spannhake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:14
CPC Classifications
B; B62; B62D; B62D49/00; B62D49/06; B62D49/0621; B62D49/0635; B62D55/00; B62D55/08; B62D55/30; B62D55/305; F; F16; F16H; F16H7/00; F16H7/08; F16H7/10; F16H7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A TRACK LAYING VEHICLE COMPRISING: WHEELS; RESILIENT TIRES ON THE WHEELS; AT LEAST ONE FLEXIBLE BAND TRACK TIGHTLY ENGAGING AT LEAST TWO WHEELS; FLUID PRESSURE OPERATED MEANS TO MAINTAIN TENSION IN THE TRACK; A SOURCE OF FLUID UNDER PRESSURE; A CONDUIT HAVING A CONNECTION WITH THE SOURCE; A SECOND CONDUIT FOR THE DISCHARGE OF SPENT FLUID; A THIRD CONDUIT CONNECTED WITH THE FLUID PRESSURE OPERATED MEANS; A FLUID PRESSURE RESPONSIVE FLUID CONDUCTING ELEMENT HAVING PASSAGES AND AN OPERATING POSITION IN WHICH THE PASSAGES CONNECT THE FIRST AND THIRD CONDUITS AND A SECOND OPERATING POSITION IN WHICH THE PASSAGES CONNECT THE FIRST AND THIRD CONDUITS AND A SECOND OPERATING POSITION IN WHICH THE PASSAGES CONNECT THE SECOND AND THIRD CONDUITS; MEANS BIASING SAID ELEMENT AGAINST FLUID PRES-
Claim 2
Dependent Claim
126 words
A TRACK LAYING VEHICLE COMPRISING: WHEELS; RESILIENT TIRES ON THE WHEELS; AT LEAST ONE FLEXIBLE BAND TRACK TIGHTLY ENGAGING AT LEAST TWO WHEELS; FLUID PRESSURE OPERATED MEANS TO MAINTAIN TENSION IN THE TRACK; A SOURCE OF FLUID UNDER PRESSURE; A CONDUIT HAVING A CONNECTION WITH THE SOURCE; A SECOND CONDUIT FOR THE DISCHARGE OF SPENT FLUID; A THIRD CONDUIT CONNECTED WITH THE FLUID PRESSURE OPERATED MEANS; A FLUID PRESSURE RESPONSIVE FLUID CONDUCTING ELEMENT HAVING PASSAGES AND AN OPERATING POSITION IN WHICH THE PASSAGES CONNECT THE FIRST AND THIRD CONDUITS AND A SECOND OPERATING POSITION IN WHICH THE PASSAGES CONNECT THE FIRST AND THIRD CONDUITS AND A SECOND OPERATING POSITION IN WHICH THE PASSAGES CONNECT THE SECOND AND THIRD CONDUITS; MEANS BIASING SAID ELEMENT AGAINST FLUID PRES-
References Cited (Backward Citations)
US2452671A
Cited
US2719062A
Cited
US2837378A
Cited
US2837379A
Cited
US2962002A
Cited
US2964023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |