US3660690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical adjustment of time-constant apparatus
Assignee: LTV LING ALTEC Inc
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Filing: 1970-11-09
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Granted: 1972-05-02
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Expires: 1990-11-09
Abstract
Abstract An auxiliary circuit for adjusting the time-constant of electrical apparatus, such as that of a relaxation oscillator having resistor-capacitor time-constant circuit elements. The adjustment is maintained while an electrical adjusting signal is present. This biases a transistor into conduction and places a second resistor in parallel with the basic resistor of the timeconstant circuit, thereby reducing the time-constant. Alternate embodiments selectively allow plural adjustments, also adjustment of plural separate electrical devices.
Inventors
- 👤 Charles Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/64; H03K3/72; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2823; H03K3/284
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
248 words
Electrical means for reducing the time-constant for an electrical circuit (20), comprising; a. a first resistive element (22) connected to said electrical circuit and determining in part said time constant, b. a second resistive element (25), c. a semiconductor device (26) having a pair of current-carrying connections and a control connection, d. first means to connect said second resistive element in series with said pair of current-carrying connections, e. second means to connect the series circuit of said second resistive element and said pair of current-carrying connections in shunt to said first resistive element, f. command means (21) connected to said control connection to selectively produce conduction between said pair of currentcarrying connections, g. a first unilateral conductor (41) interposed in said series circuit of said second resistive element (25) and said pair of current-carrying connections, h. a second electrical circuit (20'') having an inherent resistive element (32), i. an additional resistive element (34), j. a second unilateral conductor (42), and k. additional means to connect said additional resistive element (34), said second unilateral conductor, and said pair of current-carrying connections in an additional series circuit and to said second electrical circuit (20''), whereby said command means (31) connected to said control connection of said semiconductor device (36) to selectively produce conduction between said pair of current-carrying connections separately connects said second resistive element (25) in parallel with said first resistive element (22) and also said additional resistive element (34) in parallel with said inherent resistive element (32).
Claim 2
Dependent Claim
248 words
Electrical means for reducing the time-constant for an electrical circuit (20), comprising; a. a first resistive element (22) connected to said electrical circuit and determining in part said time constant, b. a second resistive element (25), c. a semiconductor device (26) having a pair of current-carrying connections and a control connection, d. first means to connect said second resistive element in series with said pair of current-carrying connections, e. second means to connect the series circuit of said second resistive element and said pair of current-carrying connections in shunt to said first resistive element, f. command means (21) connected to said control connection to selectively produce conduction between said pair of currentcarrying connections, g. a first unilateral conductor (41) interposed in said series circuit of said second resistive element (25) and said pair of current-carrying connections, h. a second electrical circuit (20'') having an inherent resistive element (32), i. an additional resistive element (34), j. a second unilateral conductor (42), and k. additional means to connect said additional resistive element (34), said second unilateral conductor, and said pair of current-carrying connections in an additional series circuit and to said second electrical circuit (20''), whereby said command means (31) connected to said control connection of said semiconductor device (36) to selectively produce conduction between said pair of current-carrying connections separately connects said second resistive element (25) in parallel with said first resistive element (22) and also said additional resistive element (34) in parallel with said inherent resistive element (32).
Claim 3
Dependent Claim
60 words
The means of claim 1 which additionally includes; a. a bias source (44), b. a series impedance (43), and c. means to connect said bias source through said series impedance to said first and second unilateral conductors to bias these unilateral conductors into non-conduction save when conduction is produced between the pair of current-carrying connections of said semiconductor device (36).
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |