US3138970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratio sensitive control for limited slip differentials
Assignee: Caterpillar Inc
•
Filing: 1961-04-05
•
Granted: 1964-06-30
•
Expires: 1981-04-05
Abstract
No abstract record available.
Inventors
- 👤 Philip J Costa
- 👤 Harry H Bowen
- 👤 Jr John H Babbitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
F; F16; F16H; F16H48/00; F16H48/20; F16H48/22; F16H48/06; F16H48/08; F16H48/30; F16H48/34; F16H2048/204; F16H2200/00; F16H2200/20; F16H2200/203; F16H2200/2071; F16H48/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A SYSTEM FOR CONTROLLING SLIP OF A PAIR OF WHEELS DRIVEN THROUGH DIFFERENTIAL GEARING HAVING A FLUID ACTUATED CLUTCH FOR LIMITING DIFFERENTIAL ACTION COMPRISING MAGNETIC PICKUPS DISPOSED TO TRANSDUCE THE SPEED OF EACH WHEEL TO ELECTRICAL ENERGIES, ELECTRICAL MEANS FOR TRANSFORMING THE ELECTRICAL ENERGIES FROM SAID MAGNETIC PICKUPS TO ELECTRICAL ENERGIES IN THE FORM OF CONSTANT AMPLITUDE SQUARE WAVES OF FREQUENCIES PROPORTIONAL TO SAID WHEEL SPEEDS, ELECTRICAL CIRCUIT MEANS FOR TRANSFORMING SAID SQUARE WAVES TO DIRECT CURRENT POTENTIALS WHICH ARE INVERSE FUNCTIONS OF SAID FREQUENCIES OF SAID SQUARE WAVES, AND MEANS OPERABLE AUTOMATICALLY UPON SAID DIRECT CURRENT POTENTIALS DIFFERING BY A PREDETERMINED AMOUNT FOR ACTUATING SAID FLUID ACTUATED CLUTCH.
Claim 2
Independent Claim
109 words
A SYSTEM FOR CONTROLLING SLIP OF A PAIR OF WHEELS DRIVEN THROUGH DIFFERENTIAL GEARING HAVING A FLUID ACTUATED CLUTCH FOR LIMITING DIFFERENTIAL ACTION COMPRISING MAGNETIC PICKUPS DISPOSED TO TRANSDUCE THE SPEED OF EACH WHEEL TO ELECTRICAL ENERGIES, ELECTRICAL MEANS FOR TRANSFORMING THE ELECTRICAL ENERGIES FROM SAID MAGNETIC PICKUPS TO ELECTRICAL ENERGIES IN THE FORM OF CONSTANT AMPLITUDE SQUARE WAVES OF FREQUENCIES PROPORTIONAL TO SAID WHEEL SPEEDS, ELECTRICAL CIRCUIT MEANS FOR TRANSFORMING SAID SQUARE WAVES TO DIRECT CURRENT POTENTIALS WHICH ARE INVERSE FUNCTIONS OF SAID FREQUENCIES OF SAID SQUARE WAVES, AND MEANS OPERABLE AUTOMATICALLY UPON SAID DIRECT CURRENT POTENTIALS DIFFERING BY A PREDETERMINED AMOUNT FOR ACTUATING SAID FLUID ACTUATED CLUTCH.
References Cited (Backward Citations)
US2353554A
Cited
US2401628A
Cited
US2991373A
Cited
US2925559A
Cited
US2936427A
Cited
US2981852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |