Patent US3787719A successfully refreshed from Google Patents.
US3787719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triac
Assignee: Westinghouse Brake English Electric Semi Conductors Ltd
•
Filing: 1972-11-10
•
Granted: 1974-01-22
•
Expires: 1992-11-10
Abstract
Abstract A triac element, in plan view, has a first portion of each emitter region lying one over the other and a second portion of each emitter region spaced one from the other by a distance sufficiently greater that, in operation, carriers attempting to cross the space between the second portions re-combine before succeeding in crossing. The element has metallized contacts at least one of which is in ohmic contact with one of the emitter regions, and that contact has therein an aperture of dimensions comparable to that of the spacing between the second portions of the emitter regions and, in plan view, is located in line with those portions of the emitter regions which interconnect the first and second portions of each emitter region. There may be two such metallized contacts, one in ohmic contact with each of the emitter regions.
Inventors
- 👤 T Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:23
CPC Classifications
H; H10; H10D; H10D18/00; H10D18/80
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
A triac element of which, in plan view of the element, a first portion of each emitter region lies one over the other and a second portion of each emitter region is spaced one from the other by a distance sufficiently great that, in operation of the element, carriers attempting to cross the space between the second portions recombine before succeeding in so crossing; the element further having first and second metallized contacts, said first contact being in ohmic contact with one of the emitter regions, and said first contact having therein an aperture of dimensions comparable to that of the spacing between the second portions of the emitter regions and, in plan view of the element, being located in line with those portions of the emitter regions which interconnect the first and second portions of each omitter region, said second contact being in ohmic contact with the other of said emitter regions and having an aperture therein at least a portion of which is aligned with the aperture in said first contact.
Claim 2
Dependent Claim
173 words
A triac element of which, in plan view of the element, a first portion of each emitter region lies one over the other and a second portion of each emitter region is spaced one from the other by a distance sufficiently great that, in operation of the element, carriers attempting to cross the space between the second portions recombine before succeeding in so crossing; the element further having first and second metallized contacts, said first contact being in ohmic contact with one of the emitter regions, and said first contact having therein an aperture of dimensions comparable to that of the spacing between the second portions of the emitter regions and, in plan view of the element, being located in line with those portions of the emitter regions which interconnect the first and second portions of each omitter region, said second contact being in ohmic contact with the other of said emitter regions and having an aperture therein at least a portion of which is aligned with the aperture in said first contact.
Claim 3
Dependent Claim
28 words
An element as claimed in claim 1, wherein the spacing between the second portions of the emitter regions (in plan view of the element) are three diffusion lengths.
Claim 4
Dependent Claim
55 words
An element as claimed in claim 1 wherein that one of the emitter regions extending inwardly from the face of the element from which extends inwardly the gate region, has a body portion and a finger portion, the finger portion and a part of the body portion constituting the first portion of that emitter region.
Claim 5
Dependent Claim
27 words
An element as claimed in claim 3, wherein the element is rectangular in plan view and the gate region is located adjacent one corner of the element.
References Cited (Backward Citations)
US3263139A
Cited
US3317746A
Cited
US3391310A
Cited
US3350611A
Cited
US3360696A
Cited
US3443171A
Cited
US3504241A
Cited
US3549961A
Cited
US3696273A
Cited
US3622841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |