Patent US3795044A successfully refreshed from Google Patents.
US3795044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of contacting a semiconductor body having a plurality of electrodes utilizing sheet metal electric leads
Assignee: Siemens AG
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Filing: 1971-07-22
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Granted: 1974-03-05
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Expires: 1991-07-22
Abstract
Abstract In a method of contacting a semiconductor body provided with several electrodes, utilizing a plurality of sheet metal electric leads, the thickness or width of the sheet metal is reduced at the ends of the tongue-like electric sheet metal leads with respect to the parts thereof bordering a common holder frame therefor. The ends of the leads are directly connected to the electrodes of the semiconductor body provided therefor.
Inventors
- 👤 H Peltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:00
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/01; H10W70/04; H10W70/042; H10W70/40; H10W70/421; H10W70/424; H10W72/00; H10W72/50; H10W72/541; H10W72/5449; H10W90/00; H10W90/701; H10W90/751; H10W90/756; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
241 words
A method of contacting a semiconductor body which is provided with several electrodes, utilizing a system of electric leads made of a metal sheet, the leads extending tongue-like from a holder frame into the interior of the frame and having the tongue ends for conductive connection with individual electrodes, said method comprising the steps of applying a complete mask of photovarnish to one side of a metal sheet to be converted to the system of leads which mask covers only the sheet metal portions which are subsequently to constitute the holder frame and all of the tongue-like leads; applying an incomplete photo-varnish mask to the other side of the metal sheet which mask covers only the sheet metal portions corresponding to the holder frame and the parts of the tongue-like leads adjacent to the holder frame; etching depressions into the metal sheet using the photo-varnish masks as etching masks; replacing the complete photo-varnish mask by a photo-varnish layer which fully covers the side of the metal sheet that had been previously covered by the complete photovarnish mask continuing the etching process until the sheet portions corresponding to the tongue-like leads are just discernibly separated from each other at the ends of reduced thickness and along their remaining lengths up to the holder frame; placing the semiconductor body and its electrodes into contact with the ends of the tongue-like leads; and permanently joining the ends of the tongue-like leads and the electrodes.
Claim 2
Independent Claim
241 words
A method of contacting a semiconductor body which is provided with several electrodes, utilizing a system of electric leads made of a metal sheet, the leads extending tongue-like from a holder frame into the interior of the frame and having the tongue ends for conductive connection with individual electrodes, said method comprising the steps of applying a complete mask of photovarnish to one side of a metal sheet to be converted to the system of leads which mask covers only the sheet metal portions which are subsequently to constitute the holder frame and all of the tongue-like leads; applying an incomplete photo-varnish mask to the other side of the metal sheet which mask covers only the sheet metal portions corresponding to the holder frame and the parts of the tongue-like leads adjacent to the holder frame; etching depressions into the metal sheet using the photo-varnish masks as etching masks; replacing the complete photo-varnish mask by a photo-varnish layer which fully covers the side of the metal sheet that had been previously covered by the complete photovarnish mask continuing the etching process until the sheet portions corresponding to the tongue-like leads are just discernibly separated from each other at the ends of reduced thickness and along their remaining lengths up to the holder frame; placing the semiconductor body and its electrodes into contact with the ends of the tongue-like leads; and permanently joining the ends of the tongue-like leads and the electrodes.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, comprising the step of etching the metal sheet to produce the tongue-like leads and the holder frame connecting the leads.
Claim 4
Dependent Claim
61 words
A method as claimed in claim 1, comprising the step of embedding the semiconductor body and the ends of the tongue-like leads and at least part of the thicker portion of the tongue-like leads in a block of plastic material after the semiconductor body is mounted, and thereafter removing the holder frame to insulate the individual tongue-like leads from each other.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |