Patent US3723966A successfully refreshed from Google Patents.
US3723966A
Expired / Lapsed
US
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Interrogating tire pressure indicator
Assignee: Bendix Corp
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Filing: 1970-09-14
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Granted: 1973-03-27
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Expires: 1990-09-14
Abstract
Abstract A tire pressure indicating arrangement in which a passive transponding element is used as the tire pressure condition responsive sensor at each tire and an active transmitter is used to interrogate either successively or simultaneously each transponder, each of which is in turn adapted to transpond back to a receiver in response to the transmitter signal in the event tire pressure declines to an unsafe level. The receiver signal is then used to activate an alarm or indicating device.
Inventors
- 👤 R Mueller
- 👤 W Wolber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:05
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/077; G06K19/07749; G06K19/07758; G06K19/07764; B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/0433
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A vehicle wheel and tire assembly condition indicating arrangement comprising: transmitter means for transmitting a signal of radio frequency radiation; transponding means carried by said wheel and tire assembly and adapted to transpond a signal of radio frequency radiation in response to said transmitter means radiated signal; sensor means causing a variation in the tRansponding activity of said transponding means in response to variations in said wheel and tire assembly condition; indicator means carried by said vehicle providing indicator signals in response to said transponding means radiated signal indicating a variation in said wheel and tire assembly condition.
Claim 2
Dependent Claim
98 words
A vehicle wheel and tire assembly condition indicating arrangement comprising: transmitter means for transmitting a signal of radio frequency radiation; transponding means carried by said wheel and tire assembly and adapted to transpond a signal of radio frequency radiation in response to said transmitter means radiated signal; sensor means causing a variation in the tRansponding activity of said transponding means in response to variations in said wheel and tire assembly condition; indicator means carried by said vehicle providing indicator signals in response to said transponding means radiated signal indicating a variation in said wheel and tire assembly condition.
Claim 3
Dependent Claim
29 words
The arrangement of claim 1 wherein said sensor means includes pressure sensing means causing a variation in said transponding means activity in response to a change in tire pressure.
Claim 4
Dependent Claim
26 words
The arrangement of claim 2 wherein said sensing means includes means causing said transponding means to be inoperative above a predetermined pressure level in said tire.
Claim 5
Dependent Claim
31 words
The arrangement of claim 3 wherein said transponding means includes an oscillatory circuit and said sensor means includes means interrupting said circuit whenever said tire pressure exceeds a predetermined pressure level.
Claim 6
Dependent Claim
40 words
The arrangement of claim 1 wherein said transponding means includes a variable frequency oscillatory circuit and wherein said sensor means includes means varying the frequency of said oscillatory circuit in response to changes in said wheel and tire assembly condition.
Claim 7
Dependent Claim
21 words
The arrangement of claim 5 wherein said sensor means varies the capacitance of said circuit as a function of tire pressure.
Claim 8
Dependent Claim
21 words
The arrangement of claim 5 wherein said sensor means varies the inductance of said circuit as a function of tire pressure.
Claim 9
Dependent Claim
57 words
The indicator arrangement of claim 1 further including a plurality of said transponding means each carried by a respective wheel and tire assembly and wherein each of said transponding means signals is of a different frequency, and wherein said transmitter means transmits signals of a range of frequencies including said frequencies of each of said transponding means.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |