US4592131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing resin-sealed semiconductor device
Assignee: Toshiba Corp
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Filing: 1984-12-18
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Granted: 1986-06-03
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Expires: 2004-12-18
Abstract
Abstract A method for manufacturing a resin-sealed semiconductor device wherein after a semiconductor pellet is sealed to a leadframe with a resin, outer leads projected from the leadframe and adhered with burrs are collapsed by their upper or upper and lower corners and then the burrs are removed by blasting.
Inventors
- 👤 Toshikazu Deie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:51
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/02; H; H10; H10W; H10W72/00; H10W74/00; H10W74/01; B29C70/00; B29C70/68; B29C70/72; B29L; B29L2031/00; B29L2031/34; B29L2031/3406; Y; Y10; Y10S; Y10S83/00; Y10S83/914; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A method for manufacturing a sealed semiconductor-containing element fastened to a leadframe having outer lead members comprising the steps of: (i) sealing said element, and the portion of said leadframe to which said element is fastened, with resin; (ii) after said sealing step collapsing a pair of adjacent corners of said outer lead members in the longitudinal direction along said members, said adjacent corners both being coplanar with either the top or bottom plane of said leadframe; and (iii) removing resin which adhered during the sealing step to the sides of said outer lead members.
Claim 2
Independent Claim
95 words
A method for manufacturing a sealed semiconductor-containing element fastened to a leadframe having outer lead members comprising the steps of: (i) sealing said element, and the portion of said leadframe to which said element is fastened, with resin; (ii) after said sealing step collapsing a pair of adjacent corners of said outer lead members in the longitudinal direction along said members, said adjacent corners both being coplanar with either the top or bottom plane of said leadframe; and (iii) removing resin which adhered during the sealing step to the sides of said outer lead members.
Claim 3
Dependent Claim
28 words
The method of claim 1 comprising the additional step of collapsing an additional pair of adjacent corners on said lead members opposite said first pair of adjacent corners.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said collapsing step removes a portion of the resin adhered to the sides of said outer lead members.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein said collapsing step is performed using a die having a concave pressing surface.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein said die surface is V-shaped.
Claim 7
Dependent Claim
11 words
The method of claim 4 wherein said die surface is arc-shaped.
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) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |