Patent US2884018A successfully refreshed from Google Patents.
Patent US3646367A successfully refreshed from Google Patents.
US3646367A
Expired / Lapsed
US
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Electrical switch
Assignee: Collins Radio Co
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Filing: 1970-01-05
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Granted: 1972-02-29
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Expires: 1990-01-05
Abstract
Abstract An electrical switch for large currents including a transistor element which is driven into saturation upon closing said switch. Means is provided to cause forward biasing of the base-collector junction of said transistor to force transistor current saturation.
Inventors
- 👤 Paul L Conant Sr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:03
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/12; H03K17/04; H03K17/041; H03K17/04113
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
An electrical switch for switching large currents through a load comprising: a. a first PNP bipolar transistor having an input electrode, an output electrode, and a control electrode; b. a small diode resistance means having first and second electrodes; c. means connecting the anode of said diode resistance means to said output electrode of saiD first transistor; d. a second NPN bipolar transistor having an input electrode, an output electrode and a control electrode; e. means connecting said output electrode of said second transistor to said control electrode of said first transistor; f. means connecting said input electrode of said second transistor to the other electrode of said resistance means; g. said control electrode of said second transistor functioning as the control terminal of the electrical switch and controlling the conductivity of said second transistor; and h. means connecting said load to said input electrode of said first transistor.
Claim 2
Dependent Claim
149 words
An electrical switch for switching large currents through a load comprising: a. a first PNP bipolar transistor having an input electrode, an output electrode, and a control electrode; b. a small diode resistance means having first and second electrodes; c. means connecting the anode of said diode resistance means to said output electrode of saiD first transistor; d. a second NPN bipolar transistor having an input electrode, an output electrode and a control electrode; e. means connecting said output electrode of said second transistor to said control electrode of said first transistor; f. means connecting said input electrode of said second transistor to the other electrode of said resistance means; g. said control electrode of said second transistor functioning as the control terminal of the electrical switch and controlling the conductivity of said second transistor; and h. means connecting said load to said input electrode of said first transistor.
Claim 3
Dependent Claim
148 words
An electrical switch for switching large currents through a load comprising: a. first NPN bipolar transistor having an input electrode, and output electrode, and a control electrode; b. a small diode resistance means having first and second electrodes; c. means connecting the cathode of said diode resistance means to said output electrode of said first transistor; d. a second PNP bipolar transistor having an input electrode, an output electrode and a control electrode; e. means connecting said output electrode of said second transistor to said control electrode of said first transistor; f. means connecting said input electrode of said second transistor to the other electrode of said resistance means; g. said control electrode of said second transistor functioning as the control terminal of the electrical switch and controlling the conductivity of said second transistor; and h. means connecting said load to said input electrode of said first transistor.
Claim 4
Dependent Claim
148 words
An electrical switch for switching large currents through a load comprising: a. first NPN bipolar transistor having an input electrode, and output electrode, and a control electrode; b. a small diode resistance means having first and second electrodes; c. means connecting the cathode of said diode resistance means to said output electrode of said first transistor; d. a second PNP bipolar transistor having an input electrode, an output electrode and a control electrode; e. means connecting said output electrode of said second transistor to said control electrode of said first transistor; f. means connecting said input electrode of said second transistor to the other electrode of said resistance means; g. said control electrode of said second transistor functioning as the control terminal of the electrical switch and controlling the conductivity of said second transistor; and h. means connecting said load to said input electrode of said first transistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |