US3772529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable unijunction fence charger
Assignee: Individual
•
Filing: 1972-05-08
•
Granted: 1973-11-13
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Expires: 1992-05-08
Abstract
Abstract A portable fence charger which comprises a relaxation oscillator having a programmable unijunction transistor for producing repetitive pulses, circuitry for amplifying and applying said pulses to a fence, and a repetitively flashing light to indicate proper function of the charger and fence.
Inventors
- 👤 P Boeing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:10
CPC Classifications
H; H05; H05C; H05C1/00; H05C1/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
For use with a conductive fence, a charger comprising a source of electrical power, a relaxation oscillator, first circuit means connecting said power source and said oscillator to enable said oscillator to produce electrical pulses, said oscillator comprising a programmable unijunction transistor, means for controlling the periodicity of said pulses being connected to said transistor, means for controlling the width of said pulses connected to said transistor, means for amplifying the time and width controlled pulses, second circuit means connecting said amplifying means to said oscillator, and third circuit means connecting said amplifying means to said fence.
Claim 2
Dependent Claim
97 words
For use with a conductive fence, a charger comprising a source of electrical power, a relaxation oscillator, first circuit means connecting said power source and said oscillator to enable said oscillator to produce electrical pulses, said oscillator comprising a programmable unijunction transistor, means for controlling the periodicity of said pulses being connected to said transistor, means for controlling the width of said pulses connected to said transistor, means for amplifying the time and width controlled pulses, second circuit means connecting said amplifying means to said oscillator, and third circuit means connecting said amplifying means to said fence.
Claim 3
Dependent Claim
27 words
For use with a conductive fence, a charger as defined in claim 1 and further characterized by said source of electrical power being a low voltage battery.
Claim 4
Dependent Claim
62 words
For use with a conductive fence, a charger as defined in claim 1 anD further characterized by said programmable unijunction transistor having an anode and a cathode, said means for controlling the periodicity of said pulses being connected to the anode of said transistor, and said means for controlling the width of said pulses being connected to said cathode of said transistor.
Claim 5
Dependent Claim
33 words
For use with a conductive fence, a charger as defined in claim 3 and further characterized by said transistor also having a gate, and biasing means connected to the gate of said transistor.
Claim 6
Dependent Claim
31 words
For use with a conductive fence, a charger as defined in claim 4 and further characterized by said biasing means being adjustable to compensate for any diminution in the power source.
Claim 7
Dependent Claim
32 words
For use with a conductive fence, a charger as defined in claim 3 and further characterized by said means for controlling the pulse periodicity comprising a fixed resistor and a fixed capacitor.
Claim 8
Dependent Claim
42 words
For use with a conductive fence, a charger as defined in claim 6 and further characterized by said means for controlling the pulse width comprising a first fixed resistor connected between the cathode of said programmable unijunction transistor and said power source.
Claim 9
Dependent Claim
49 words
For use with a conductive fence, a charger as defined in claim 7 and further characterized by said biasing means comprising a fixed resistor and a variable resistor connected to said power source, and with there being a conductor between said variable resistor and the gate of said transistor.
Claim 10
Dependent Claim
52 words
For use with a conductive fence, a charger as defined in claim 1 and further characterized by said amplifying means comprising a first transistor, a second transistor, said first and second transistors being in cascade relationship, and a transformer being between said cascaded first and second transistors and said third circuit means.
Claim 11
Dependent Claim
43 words
For use with a conductive fence, a charger as defined in claim 7 and further characterized by said second circuit means comprising a second fixed resistor one end of which is connected to said cathode of said programmable unijunction transistor of said oscillator.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |