Patent US3805263A successfully refreshed from Google Patents.
US3805263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for detecting an object
Assignee: Individual
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Filing: 1972-08-15
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Granted: 1974-04-16
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Expires: 1992-08-15
Abstract
Abstract A detecting system including a low power UHF oscillator circuit. The oscillator is adjusted to a high impedance, and coupled to an antenna for radiating an extremely weak level signal therefrom. Signals re-radiated from a moving body are received by the antenna and change the oscillator frequency which is sensed to develop a control signal. The oscillator design provides a very high sensitivity detector in a simple and inexpensive circuit to reduce cost and power consumption.
Inventors
- 👤 T Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:09
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/101; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/56; G08; G08G; G08G1/00; G08G1/16; G08G1/166
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A system for detecting an object comprising: an antenna for radiating electromagnetic energy and for receiving reflecTed energy from an object; means coupling said antenna to a UHF oscillator adjusted for a high output impedance; means for supplying electrical energy to said oscillator, said means being adjustable to bring said oscillator into oscillation such that reflected energy from an object varies the radiation impedance coupled to said oscillator from said antenna; and detection means direct current coupled to said oscillator and responsive to signals developed by said oscillator in response to changes in radiation impedance when an object is within the range of said detecting system to generate a control signal in response thereto.
Claim 2
Independent Claim
114 words
A system for detecting an object comprising: an antenna for radiating electromagnetic energy and for receiving reflecTed energy from an object; means coupling said antenna to a UHF oscillator adjusted for a high output impedance; means for supplying electrical energy to said oscillator, said means being adjustable to bring said oscillator into oscillation such that reflected energy from an object varies the radiation impedance coupled to said oscillator from said antenna; and detection means direct current coupled to said oscillator and responsive to signals developed by said oscillator in response to changes in radiation impedance when an object is within the range of said detecting system to generate a control signal in response thereto.
Claim 3
Dependent Claim
30 words
The system as defined in claim 1 wherein said supply means comprises a constant current source including a feed transistor having a constant voltage applied to a base electrode thereof.
Claim 4
Dependent Claim
34 words
The system as defined in claim 1 wherein said oscillator includes a parallel inductor-capacitor circuit wherein said inductor is etched on a circuit board and said parallel capacitor is a variable capacitor positioned thereon.
Claim 5
Dependent Claim
29 words
The system as defined in claim 3 wherein said parallel inductor-capacitor circuit further includes a second variable capacitor coupled in circuit to reduce the physical length of said inductor.
Claim 6
Dependent Claim
41 words
The system as defined in claim 1 wherein said oscillator is a UHF oscillator adjustable over a range of 20 - 30 percent of the fundamental frequency thereof such that the zero axis of a radiated signal therefrom can be varied.
Claim 7
Independent Claim
176 words
A system for detecting an object comprising: a UHF oscillator comprising an oscillator transistor having base, collector and emitter terminals with a L-C frequency determining circuit coupled between said base and collector, said L-C circuit comprising an inductor etched on a printed circuit board and at least one variable capacitor electrically coupled thereto and positioned thereon; constant current supply means including means for adjusting the current supplied therefrom to initiate oscillation of said oscillator; a high frequency choke coupling said current supply means to said oscillator transistor for providing operating energy for said oscillator; a half wave dipole antenna coupled to said L-C circuit to radiate signals from said circuit and receive signals reflected from an object; an amplifier having an input terminal direct current coupled to the junction of said current supply means and said high frequency choke for detecting signals thereat when an object is within range of said system and having output terminals for supplying amplified signals therefrom; and means coupled to said amplifier output terminals for providing control signals to utilization means.
Claim 8
Independent Claim
176 words
A system for detecting an object comprising: a UHF oscillator comprising an oscillator transistor having base, collector and emitter terminals with a L-C frequency determining circuit coupled between said base and collector, said L-C circuit comprising an inductor etched on a printed circuit board and at least one variable capacitor electrically coupled thereto and positioned thereon; constant current supply means including means for adjusting the current supplied therefrom to initiate oscillation of said oscillator; a high frequency choke coupling said current supply means to said oscillator transistor for providing operating energy for said oscillator; a half wave dipole antenna coupled to said L-C circuit to radiate signals from said circuit and receive signals reflected from an object; an amplifier having an input terminal direct current coupled to the junction of said current supply means and said high frequency choke for detecting signals thereat when an object is within range of said system and having output terminals for supplying amplified signals therefrom; and means coupled to said amplifier output terminals for providing control signals to utilization means.
Claim 9
Dependent Claim
29 words
The system as defined in claim 6 and further including oscillator temperature compensation means comprising a series resistance and transistor coupled from said L-C circuit to a reference potential.
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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |