US3339672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission control system
Assignee: Hyster Co
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Filing: 1965-11-29
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Granted: 1967-09-05
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Expires: 1985-11-29
Abstract
No abstract record available.
Inventors
- 👤 Richard E Crandall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:38
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; A; A23; A23B; A23B7/00; A23B7/14; A23B7/144; A23B7/152; B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/07509; B66F9/07595; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/32; F15B2211/329; F15B2211/355; F15B2211/365; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/415; F15B2211/41509; F15B2211/42; F15B2211/426; F15B2211/428; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/50554; F15B2211/515; F15B2211/5151; F15B2211/52; F15B2211/528; F15B2211/55; F15B2211/60; F15B2211/62; F15B2211/635; F15B2211/6355; F15B2211/665; F15B2211/6653; F15B2211/6654; F15B2211/67; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/7058; F15B2211/71; F15B2211/76; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7782
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN A LIFT TRUCK HAVING A DRIVEN WHEEL, HOIST MEANS, AN ENGINE FOR SUPPLYING POWER TO SAID WHEEL AND SAID HOIST MEANS, A TRANSMISSION INCLUDING FLUID-ACTUATED CLUTCH MEANS FOR ALTERNATIVELY TRANSMITTING OR INTERRUPTING ENGINE POWER TO SAID WHEEL AND DRIVING SAID WHEEL IN EITHER A FORWARD OR REVERSE DIRECTION, AND CLUTCH-OPERATING MEANS, SAID CLUTCH-OPERATING MEANS COMPRISING: CLUTCH FLUID PASSAGE MEANS FOR DIRECTING A PRESSURE FLUID FROM A SOURCE OF SUPPLY TO SAID CLUTCH MEANS, PUMP MEANS FOR PUMPING FLUID UNDER PRESSURE THROUGH SAID PASSAGE MEANS TO SAID CLUTCH MEANS FOR ENGAGING THE SAME, AND PRESSURE-RESPONSIVE MODULATOR MEANS OPERABLE UNDER A PREDETERMINED FLUID PRESSURE BUILDUP IN SAID PASSAGE MEANS JUST SUFFICIENT TO CLOSE UP SAID CLUTCH MEANS BUT INSUFFICIENT TO CAUSE CLUTCH LOCK-UP, TO RESTRICT SAID PASSAGE MEANS THEREAFTER AND THEREBY SLOW THE BUILD-UP OF FLUID PRESSURE AT SAID CLUTCH MEANS BEYOND SAID PRE-
Claim 2
Dependent Claim
143 words
IN A LIFT TRUCK HAVING A DRIVEN WHEEL, HOIST MEANS, AN ENGINE FOR SUPPLYING POWER TO SAID WHEEL AND SAID HOIST MEANS, A TRANSMISSION INCLUDING FLUID-ACTUATED CLUTCH MEANS FOR ALTERNATIVELY TRANSMITTING OR INTERRUPTING ENGINE POWER TO SAID WHEEL AND DRIVING SAID WHEEL IN EITHER A FORWARD OR REVERSE DIRECTION, AND CLUTCH-OPERATING MEANS, SAID CLUTCH-OPERATING MEANS COMPRISING: CLUTCH FLUID PASSAGE MEANS FOR DIRECTING A PRESSURE FLUID FROM A SOURCE OF SUPPLY TO SAID CLUTCH MEANS, PUMP MEANS FOR PUMPING FLUID UNDER PRESSURE THROUGH SAID PASSAGE MEANS TO SAID CLUTCH MEANS FOR ENGAGING THE SAME, AND PRESSURE-RESPONSIVE MODULATOR MEANS OPERABLE UNDER A PREDETERMINED FLUID PRESSURE BUILDUP IN SAID PASSAGE MEANS JUST SUFFICIENT TO CLOSE UP SAID CLUTCH MEANS BUT INSUFFICIENT TO CAUSE CLUTCH LOCK-UP, TO RESTRICT SAID PASSAGE MEANS THEREAFTER AND THEREBY SLOW THE BUILD-UP OF FLUID PRESSURE AT SAID CLUTCH MEANS BEYOND SAID PRE-
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) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |