US3604950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit
Assignee: General Electric Co
•
Filing: 1969-05-07
•
Granted: 1971-09-14
•
Expires: 1989-05-07
Abstract
Abstract One of two input circuits is selectively connected to an output circuit through first and second PNP-type transistors. Normally, the first transistor is turned off and the second transistor is turned on to disconnect the first input circuit from the output circuit, and to connect the second input circuit to the output circuit. The first transistor can be turned on and the second transistor can be turned off by a switching signal to connect the first input circuit to the output circuit, and to disconnect the second input circuit from the output circuit.
Inventors
- 👤 Melvin T Anderson
- 👤 James E Luth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:47
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H03K17/6257
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
254 words
An improved circuit for selectively switching one of first and second input circuits to an output circuit comprising: a. first and second PNP-type transistors each having an emitter, a base, and a collector; b. a first direct-current impedance circuit having a first resistor connected between said emItter of said first transistor and a point of reference potential and a second resistor connected between said collector of said first transistor and said point of reference potential; c. a second direct-current impedance circuit having a source of direct current potential with its positive terminal connected to said emitter of said second transistor and its negative terminal connected to said point of reference potential, and a third resistor connected between said point of reference potential and said collector of said second transistor to render said second transistor normally conductive; d. means connecting said base of said first transistor to a point on said third resistor; e. means connecting said base of said second transistor to a point on said first resistor; f. means connecting said first input circuit to said collector of said first transistor; g. means connecting said second input circuit to said collector of said second transistor; h. means connecting said output circuit to said emitters of both said first and second transistors; i. and means for selectively applying a positive-going voltage through a point on said first resistor to said emitter of said first transistor and to said base of said second transistor for rendering said first transistor conductive and said second transistor nonconductive.
Claim 2
Dependent Claim
254 words
An improved circuit for selectively switching one of first and second input circuits to an output circuit comprising: a. first and second PNP-type transistors each having an emitter, a base, and a collector; b. a first direct-current impedance circuit having a first resistor connected between said emItter of said first transistor and a point of reference potential and a second resistor connected between said collector of said first transistor and said point of reference potential; c. a second direct-current impedance circuit having a source of direct current potential with its positive terminal connected to said emitter of said second transistor and its negative terminal connected to said point of reference potential, and a third resistor connected between said point of reference potential and said collector of said second transistor to render said second transistor normally conductive; d. means connecting said base of said first transistor to a point on said third resistor; e. means connecting said base of said second transistor to a point on said first resistor; f. means connecting said first input circuit to said collector of said first transistor; g. means connecting said second input circuit to said collector of said second transistor; h. means connecting said output circuit to said emitters of both said first and second transistors; i. and means for selectively applying a positive-going voltage through a point on said first resistor to said emitter of said first transistor and to said base of said second transistor for rendering said first transistor conductive and said second transistor nonconductive.
Claim 3
Dependent Claim
29 words
The improved circuit of claim 1 wherein each of said means connecting said first and second input circuits and said output circuits to said transistors comprise a respective capacitor.
References Cited (Backward Citations)
US3007056A
Cited
US3098214A
Cited
US3051854A
Cited
US3023321A
Cited
US3136859A
Cited
US3235840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |