US3930224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission of information
Assignee: MILL JOHANNES G VAN
•
Filing: 1973-04-23
•
Granted: 1975-12-30
•
Expires: 1993-04-23
Abstract
Abstract A warning device associated with a rotatable body comprising means on the rotatable body for creating a magnetic field, a receiving coil on a relatively stationary member arranged such that upon rotation of the rotatable body interaction with the magnetic field causes electrical pulses to be generated in the receiving coil and an electronic switching circuit operated by the pulses such that a warning is given upon occurrence of a predetermined condition, such as pressure of a vehicle wheel deviating outside a predetermined limit.
Inventors
- 👤 Roland G Whiteing
- 👤 Mill Johannes G Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/0427; B60C23/043; G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
205 words
A warning device associated with a movable body comprising: transmitter means mounted on said body to move therewith, said transmitter means including a single transmitter coil and a condition-responsive switch electrically interconnected with said coil whereby a circuit is completed through the coil dependent upon the position of the switch; receiver means mounted on a stationary body adjacent said movable body, said receiver means including a single receiver coil and a magnetic field source, said source being capable of inducing a current in said transmitter coil when proximate said transmitter coil; a magnetically operated switch connected in parallel with said transmitter coil and operated by said source as current is induced in said transmitter coil so as to produce a back E.M.F. which is inductively coupled by the transmitter coil to said receiver coil when the condition-responsive switch is positioned to prevent completion of said circuit through the transmitter coil and the condition-responsive switch; and means joined to said receiver coil and responsive to a predetermined level of voltage induced on the receiver coil as a result of said back E.M.F. for providing a warning upon occurrence of a condition which changes the position of said condition-responsive switch to one preventing completion of said circuit.
Claim 2
Dependent Claim
205 words
A warning device associated with a movable body comprising: transmitter means mounted on said body to move therewith, said transmitter means including a single transmitter coil and a condition-responsive switch electrically interconnected with said coil whereby a circuit is completed through the coil dependent upon the position of the switch; receiver means mounted on a stationary body adjacent said movable body, said receiver means including a single receiver coil and a magnetic field source, said source being capable of inducing a current in said transmitter coil when proximate said transmitter coil; a magnetically operated switch connected in parallel with said transmitter coil and operated by said source as current is induced in said transmitter coil so as to produce a back E.M.F. which is inductively coupled by the transmitter coil to said receiver coil when the condition-responsive switch is positioned to prevent completion of said circuit through the transmitter coil and the condition-responsive switch; and means joined to said receiver coil and responsive to a predetermined level of voltage induced on the receiver coil as a result of said back E.M.F. for providing a warning upon occurrence of a condition which changes the position of said condition-responsive switch to one preventing completion of said circuit.
Claim 3
Dependent Claim
15 words
A warning device as set forth in claim 1, wherein said movable body is rotatable.
Claim 4
Dependent Claim
19 words
A warning device as set forth in claim 1, wherein said magnetically operated switch is a normally-open reed switch.
Claim 5
Dependent Claim
27 words
A warning device as set forth in claim 1, wherein said condition-responsive switch and said magnetically operated switch each are connected in parallel with said transmitter coil.
Claim 6
Dependent Claim
45 words
A warning device as set forth in claim 4, wherein said magnetically operated switch is a normally-open reed switch and wherein said condition-operated switch is a normally closed switch which is opened on occurrence of the condition which changes the position of said condition-responsive switch.
Claim 7
Dependent Claim
41 words
A warning device as set forth in claim 1, wherein said means responsive to a predetermined level of voltage induced on the receiver coil includes a silicon-controlled rectifier biased by said induced voltage and display means connected to said silicon-controlled rectifier.
References Cited (Backward Citations)
US2269083A
Cited
US2475533A
Cited
US3093812A
Cited
US3662335A
Cited
US3715719A
Cited
US3665387A
Cited
US3659734A
Cited
US3781787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |