US3408542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor chopper amplifier with twin emitters
Assignee: National Semiconductor Corp
•
Filing: 1963-03-29
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Granted: 1968-10-29
•
Expires: 1983-03-29
Abstract
No abstract record available.
Inventors
- 👤 Winand J Dautzenberg
- 👤 Walter B Mitchell
- 👤 Robert L Trent
- 👤 Julius E Van Wagenen
- 👤 Richard R Rau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:32
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/303; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/601; H10; H10D; H10D62/00; H10D62/10; H10D62/117; H10D62/13; H10D62/133; H10D62/135; H10D99/00; H10W; H10W72/00; H10W72/20; H10W72/90; H10W74/00; H10W74/40; H10W74/43; H10W72/50; H10W72/531; H10W72/536; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/59; H10W72/851; H10W72/874; H10W72/884; H10W72/951; H10W72/952; H10W90/00; H10W90/701; H10W90/751; H10W90/754
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
AN ELECTRICAL SWITCHING DEVICE MADE OF SEMICONDUCTOR MATERIAL, SAID DEVICE CONSISTING OF: A FIRST REGION, A SECOND REGION AND A THIRD REGION OF A MATERIAL OF ONE CONDUCTIVITY TYPE, SAID FIRST AND SECOND REGIONS BEING SEPARATED FROM THE SAID THIRD REGION BY AN INTERVENING REGION OF A MATERIAL OF ANOTHER CONDUCTIVITY TYPE; ELECTRICALLY CONDUCTIVE ELECTRODE MEANS ON SAID FIRST, SECOND, THIRD AND INTERVENING REGIONS; BIAS CIRCUIT MEANS CONNECTED TO SAID ELECTRODES ON SAID FIRST AND SECOND REGIONS FOR CONDUCTING AN INPUT SIGNAL THROUGH SAID DEVICE IN A FIRST PATH; CONTROL BIAS CIRCUIT MEANS CONNECTED TO SAID ELECTRODES ON SAID INTERVENING REGION AND ON SAID THIRD REGION FOR CONDUCTING A CONTROL SIGNAL THROUGH SAID ELEMENT IN A SECOND PATH EXTENDING THROUGH SAID DEVICE, SAID SECOND PATH BEING, AT SUBSTANTIALLY ALL POINTS ALONG ITS LENGTH, TRANSVERSE TO SAID FIRST PATH.
Claim 2
Dependent Claim
138 words
AN ELECTRICAL SWITCHING DEVICE MADE OF SEMICONDUCTOR MATERIAL, SAID DEVICE CONSISTING OF: A FIRST REGION, A SECOND REGION AND A THIRD REGION OF A MATERIAL OF ONE CONDUCTIVITY TYPE, SAID FIRST AND SECOND REGIONS BEING SEPARATED FROM THE SAID THIRD REGION BY AN INTERVENING REGION OF A MATERIAL OF ANOTHER CONDUCTIVITY TYPE; ELECTRICALLY CONDUCTIVE ELECTRODE MEANS ON SAID FIRST, SECOND, THIRD AND INTERVENING REGIONS; BIAS CIRCUIT MEANS CONNECTED TO SAID ELECTRODES ON SAID FIRST AND SECOND REGIONS FOR CONDUCTING AN INPUT SIGNAL THROUGH SAID DEVICE IN A FIRST PATH; CONTROL BIAS CIRCUIT MEANS CONNECTED TO SAID ELECTRODES ON SAID INTERVENING REGION AND ON SAID THIRD REGION FOR CONDUCTING A CONTROL SIGNAL THROUGH SAID ELEMENT IN A SECOND PATH EXTENDING THROUGH SAID DEVICE, SAID SECOND PATH BEING, AT SUBSTANTIALLY ALL POINTS ALONG ITS LENGTH, TRANSVERSE TO SAID FIRST PATH.
References Cited (Backward Citations)
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US3046405A
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US3111590A
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FR1257419A
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US2985804A
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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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |