US3321216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling bounce in tractor-trailer combinations
Assignee: Caterpillar Inc
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Filing: 1966-04-14
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Granted: 1967-05-23
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Expires: 1986-04-14
Abstract
No abstract record available.
Inventors
- 👤 John W Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:00
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/02; B62D53/021; E; E02; E02F; E02F3/00; E02F3/04; E02F3/64; E02F3/6454; E02F3/6481; E02F3/65; E02F3/651; E02F3/652
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
IN COMBINATION WITH A TRACTOR-TRAILER UNIT WHEREIN THE TRAILER IS SUPPORTED ADJACENT ITS REAR END BY WHEELS AND ADJACENT ITS FORWARD END BY A HITCH ASSEMBLY WITH THE TRACTOR, MEANS FOR CONTROLLING VERTICAL BOUNCE OF THE TRACTOR WHICH COMPRISES AN EXTENSIBLE JACK CONTAINING HYDRAULIC FLUID CONNECTED BETWEEN THE TRACTOR AND TRAILER UNIT, TWO GAS-TYPE ACCUMULATORS BOTH COMMUNICATING OPERABLE TO LIMIT VERTICAL MOVEMENT OF THE FORWARD END OF THE TRAILER, AND MEANS TO VARY THE PRESSURE OF GAS IN WITH THE INTERIOR OF SAID JACK, SAID ACCUMULATORS BEING SAID ACCUMULATORS SELECTIVELY, WHEREBY ONE OF SAID ACCUMULATORS TUNES THE NATURAL FREQUENCY OF SAID MOVEMENT WHEN THE TRAILER IS EMPTY AND THE OTHER OF SAID ACCUMULATORS TUNES THE FREQUENCY OF SAID MOVEMENT WHEN THE TRAILER IS LOADED.
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) | 1970-05-22 | 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 |