US3708722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device with soldered terminals and plastic housing and method of making the same
Assignee: Erie Technological Products Inc
•
Filing: 1970-12-18
•
Granted: 1973-01-02
•
Expires: 1990-12-18
Abstract
Abstract A semiconductor device encapsulated in insulating material which is interlocked to a flange of dovetail shape in axial cross section and of non circular shape in diametral cross section, and having ohmic contacts to leads made by solder fillets between convex surfaces on the leads and planar surfaces on the semiconductor device.
Inventors
- 👤 P Wiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:16
CPC Classifications
H; H10; H10W; H10W72/00; H10W72/20; H10W74/00; H10W74/10; H10W74/111; H10W74/114
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A metal base having a depending threaded stud and a wrench surface, an upwardly presented contact on the base, a semiconductor device having an electrode connected to said contact, walls on the base extending axially from the base and surrounding the element, said walls having inner surfaces which are non circular in a plane perpendicular to the axis of the stud, and a molded plastic case embedding the device and conforming to the inner surfaces of the walls and to the surfaces of the base within said walls.
Claim 2
Dependent Claim
88 words
A metal base having a depending threaded stud and a wrench surface, an upwardly presented contact on the base, a semiconductor device having an electrode connected to said contact, walls on the base extending axially from the base and surrounding the element, said walls having inner surfaces which are non circular in a plane perpendicular to the axis of the stud, and a molded plastic case embedding the device and conforming to the inner surfaces of the walls and to the surfaces of the base within said walls.
Claim 3
Dependent Claim
23 words
The structure of claim 1 in which said non circular walls are the inner surface of an upstanding cylindrical flange surrounding said contact.
Claim 4
Dependent Claim
17 words
The structure of claim 2 in which said flange is of dovetail shape in axial cross section.
Claim 5
Dependent Claim
23 words
The structure of claim 1 in which said non circular walls have portions inclined inwardly toward said contact to interlock with said case.
Claim 6
Dependent Claim
35 words
The structure of claim 1 in which the semiconductor device has another electrode connected to a copper wire lead surrounded by a copper tube having a flange embedded in and interlocked with said plastic case.
References Cited (Backward Citations)
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Cited
GB975573A
Cited
US3210618A
Cited
US3389457A
Cited
US3474302A
Cited
US3374405A
Cited
US3408451A
Cited
US3381184A
Cited
US3428871A
Cited
US3418544A
Cited
US3532944A
Cited
US3475662A
Cited
US3559004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |