US4102347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic pain control system
Assignee: Spatial Dynamics Ltd
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Filing: 1976-12-03
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Granted: 1978-07-25
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Expires: 1996-12-03
Abstract
Abstract A constant current supply circuit including a changeable-level compliance voltage source whose output voltage is automatically reduced whenever the impedance of a load connected to the circuit exceeds a predetermined value. A sampling resistor is provided in the path for load current, and this resistor, with load current flowing, develops a related voltage whose level is employed directly to affect the operating level of the compliance voltage source.
Inventors
- 👤 Tex N. Yukl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:47
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/36014; A61N1/36021; A61N1/3603; H; H02; H02H; H02H9/00; H02H9/04; Y; Y10; Y10S; Y10S128/00; Y10S128/908
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A current supply circuit comprising a pair of output terminals adapted for connection to a load, a current source operatively connected to said terminals for supplying current to a load connected therebetween, a changeable-level voltage source for and operatively connected both to said current source and to said terminals, and voltage-level control means operatively connected both to said output terminals and to said voltage source for sensing the impedance value of any load connected between said terminals, and for changing the level of voltage produced by said voltage source in accordance with the value of such sensed impedance.
Claim 2
Dependent Claim
98 words
A current supply circuit comprising a pair of output terminals adapted for connection to a load, a current source operatively connected to said terminals for supplying current to a load connected therebetween, a changeable-level voltage source for and operatively connected both to said current source and to said terminals, and voltage-level control means operatively connected both to said output terminals and to said voltage source for sensing the impedance value of any load connected between said terminals, and for changing the level of voltage produced by said voltage source in accordance with the value of such sensed impedance.
Claim 3
Dependent Claim
25 words
The circuit of claim 1, wherein said control means includes means for monitoring the level of current flowing through a load connected between said terminals.
Claim 4
Dependent Claim
98 words
A current supply circuit comprising a pair of output terminals adapted for connection to a load, a current source operatively connected to said terminals for supplying current to a load connected therebetween, a changeable-level voltage source for and operatively connected both to said current source and to said terminals, and voltage-level control means operatively connected both to said output terminals and to said voltage source for sensing the impedance value of any load connected between said terminals, and for reducing the level of voltage produced by said voltage source with such impedance value exceeding a predetermined impedance value.
Claim 5
Dependent Claim
98 words
A current supply circuit comprising a pair of output terminals adapted for connection to a load, a current source operatively connected to said terminals for supplying current to a load connected therebetween, a changeable-level voltage source for and operatively connected both to said current source and to said terminals, and voltage-level control means operatively connected both to said output terminals and to said voltage source for sensing the impedance value of any load connected between said terminals, and for reducing the level of voltage produced by said voltage source with such impedance value exceeding a predetermined impedance value.
Claim 6
Dependent Claim
32 words
The circuit of claim 3, wherein said control means includes means in series circuit with said output terminals for monitoring the level of current flowing to a load connected between the terminals.
Claim 7
Dependent Claim
108 words
A constant current supply circuit comprising a pair of output terminals adapted for connection to a load, a selectively changeable-level constant current source operatively connected to said terminals for supplying current at different selected levels to a load connected between the terminals, a changeable-level voltage source for and operatively connected both to said current source and to said terminals, and voltage-level control means operatively connected both to said output terminals and to said voltage source for sensing the impedance value of any load connected between said terminals, and for reducing the level of voltage produced by said voltage source with such impedance value exceeding a predetermined impedance value.
Claim 8
Dependent Claim
108 words
A constant current supply circuit comprising a pair of output terminals adapted for connection to a load, a selectively changeable-level constant current source operatively connected to said terminals for supplying current at different selected levels to a load connected between the terminals, a changeable-level voltage source for and operatively connected both to said current source and to said terminals, and voltage-level control means operatively connected both to said output terminals and to said voltage source for sensing the impedance value of any load connected between said terminals, and for reducing the level of voltage produced by said voltage source with such impedance value exceeding a predetermined impedance value.
Claim 9
Dependent Claim
32 words
The circuit of claim 5, wherein said control means includes means in series circuit with said output terminals for monitoring the level of current flowing to a load connected between the terminals.
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) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |