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US3281784A
Expired / Lapsed
US
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Devices for indicating pressure or temperature changes in pneumatic tires
Assignee: Individual
•
Filing: 1963-05-27
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Granted: 1966-10-25
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Expires: 1983-05-27
Abstract
No abstract record available.
Inventors
- 👤 Farthing Horace Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:04
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/20; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/0425
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A DEVICE FOR INDICATING PRESSURE OR TEMPERATURE CHANGES IN PNEUMATIC TIRES ON VEHICLES INCLUDING A TRANSDUCER IN EACH OR A SELECTED TIRE OR TIRES OF THE VEHICLE, SAID TRANSDUCER BEING ADAPTED TO CHANGE ITS ELECTRICAL RESISTANCE PROPERTIES BY CHANGES OF AIR PRESSURE OF TEMPERATURE IN THE TIRE, A WHEATSTONE BRIDGE CIRCUIT IN WHICH THE TRANSDUCER IS CONNECTED AS THE FIRST ARM OF THE BRIDGE CIRCUIT, A VARIABLE RESISTOR FORMING THE SECOND ARM OF SAID CIRCUIT TO EFFECT BALANCE OF THE CIRCUIT UNDER NORMAL OR PREDETERMINED AIR PRESSURE OR TEMPERATURE CONDITIONS IN THE TIRE, A CENTRE TAP RESISTOR DIVIDING AN ENERGIZING CURRENT SOURCE INTO EQUAL HALVES TO CONSTITUTE THE THIRD AND FOURTH ARMS OF THE BRIDGE CIRCUIT AND A PAIR OF COMPLEMENTARY TRANSISTOR CONNECTED IN PARALLEL ACROSS THE BRIDGE CIRCUIT AND ARRANGED TO ENERGIZE SIGNAL MEANS IN THEIR RESPECTIVE COLLECTOR CIRCUITS ACCORDING TO THE DIRECTION OF FLOW OF CURRENT IN THE BRIDGE CIRCUIT WHEN THE LATTER CIRCUIT IS UNBALANCED BY AIR PRESSURE OR TEMPERATURE VARIATIONS IN THE TIRE.
Claim 2
Independent Claim
167 words
A DEVICE FOR INDICATING PRESSURE OR TEMPERATURE CHANGES IN PNEUMATIC TIRES ON VEHICLES INCLUDING A TRANSDUCER IN EACH OR A SELECTED TIRE OR TIRES OF THE VEHICLE, SAID TRANSDUCER BEING ADAPTED TO CHANGE ITS ELECTRICAL RESISTANCE PROPERTIES BY CHANGES OF AIR PRESSURE OF TEMPERATURE IN THE TIRE, A WHEATSTONE BRIDGE CIRCUIT IN WHICH THE TRANSDUCER IS CONNECTED AS THE FIRST ARM OF THE BRIDGE CIRCUIT, A VARIABLE RESISTOR FORMING THE SECOND ARM OF SAID CIRCUIT TO EFFECT BALANCE OF THE CIRCUIT UNDER NORMAL OR PREDETERMINED AIR PRESSURE OR TEMPERATURE CONDITIONS IN THE TIRE, A CENTRE TAP RESISTOR DIVIDING AN ENERGIZING CURRENT SOURCE INTO EQUAL HALVES TO CONSTITUTE THE THIRD AND FOURTH ARMS OF THE BRIDGE CIRCUIT AND A PAIR OF COMPLEMENTARY TRANSISTOR CONNECTED IN PARALLEL ACROSS THE BRIDGE CIRCUIT AND ARRANGED TO ENERGIZE SIGNAL MEANS IN THEIR RESPECTIVE COLLECTOR CIRCUITS ACCORDING TO THE DIRECTION OF FLOW OF CURRENT IN THE BRIDGE CIRCUIT WHEN THE LATTER CIRCUIT IS UNBALANCED BY AIR PRESSURE OR TEMPERATURE VARIATIONS IN THE TIRE.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |