US5338899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging of electronic devices
Assignee: LSI Corp
•
Filing: 1991-08-28
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Granted: 1994-08-16
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Expires: 2011-08-28
Abstract
Abstract An electronic device (10) encased within a moulded package body (11) has a leadframe (12) extending therefrom. In order to protect the leads (16) for the electronic device a guard ring (14) is provided on the leadframe. By making the guard ring independently of the moulded package body and fitting it separately to the leadframe one can deal with packages of any size in a simple manner and irrespective of the material of the package body (11).
Inventors
- 👤 Trevor C. Gainey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0438; H10W; H10W70/00; H10W70/40; H10W70/421; H10W70/435; H10W74/00; H10W74/10; Y; Y02; Y02B; Y02B20/00; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121; Y10T29/49124; Y10T29/4913; Y10T29/49146
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
97 words
A method of packaging an electronic device encased within a package body and having a leadframe extending therefrom, and leads formed in the leadframe and extending radially from the package body and axially below a plane of the leadframe, comprising: in a step separate and distinct from forming the package body, securing protective guard means to the leadframe, said guard means extending both above and below the leadframe and defining a spatial zone within which leads extending radially from the electronic device are protected, and said guard means extending axially further below the leadframe than the leads.
Claim 2
Independent Claim
97 words
A method of packaging an electronic device encased within a package body and having a leadframe extending therefrom, and leads formed in the leadframe and extending radially from the package body and axially below a plane of the leadframe, comprising: in a step separate and distinct from forming the package body, securing protective guard means to the leadframe, said guard means extending both above and below the leadframe and defining a spatial zone within which leads extending radially from the electronic device are protected, and said guard means extending axially further below the leadframe than the leads.
Claim 3
Dependent Claim
18 words
A method as claimed in claim 1, in which the electronic device is molded within the package body.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, wherein: the guard means is secured to the leadframe by the use of high frequency vibration.
Claim 5
Dependent Claim
97 words
A packaged electronic device comprising: an electronic device encased in a package body, a leadframe extending from the package body and including leads extending both radially from the package body and formed to extend axially below the leadframe to a depth below the leadframe, and guard means, formed separately and distinctly from the package body and secured to the leadframe, said guard means being disposed both above and below the leadframe for protecting the leads, said guard means being dimensioned and positioned so that it extends axially below the leadframe to a greater depth than the leads.
Claim 6
Dependent Claim
97 words
A packaged electronic device comprising: an electronic device encased in a package body, a leadframe extending from the package body and including leads extending both radially from the package body and formed to extend axially below the leadframe to a depth below the leadframe, and guard means, formed separately and distinctly from the package body and secured to the leadframe, said guard means being disposed both above and below the leadframe for protecting the leads, said guard means being dimensioned and positioned so that it extends axially below the leadframe to a greater depth than the leads.
Claim 7
Dependent Claim
29 words
A packaged electronic device as claimed in claim 4, wherein: the guard means is a continuous element disposed around the package body and spaced radially from the package body.
Claim 8
Dependent Claim
17 words
A packaged electronic device as claimed in claim 4, wherein: the guard means is formed of plastic.
Claim 9
Dependent Claim
29 words
A packaged electronic device as claimed in claim 4, wherein: the guard means is secured to the leadframe by induced local melting of a surface of the guard means.
Claim 10
Dependent Claim
29 words
A packaged electronic device as claimed in claim 4, wherein: the guard means is provided with at least one aperture to provide access to test points on the leadframe.
Claim 11
Dependent Claim
23 words
A method as claimed in claim 2, further comprising: securing the guard means to the leadframe by the use of high frequency vibration.
Claim 12
Dependent Claim
23 words
A packaged electronic device as claimed in claim 5, in which the guard means is formed as one or more molded plastic elements.
Claim 13
Dependent Claim
23 words
A packaged electronic device as claimed in claim 4, in which the guard means is formed as one or more molded plastic elements.
Claim 14
Dependent Claim
26 words
A packaged electronic device as claimed in claim 5, wherein: the guard means is secured to the leadframe by induced local melting of the guard means.
Claim 15
Dependent Claim
26 words
A packaged electronic device as claimed in claim 4, wherein: the guard means is secured to the leadframe by induced local melting of the guard means.
Claim 16
Dependent Claim
26 words
A packaged electronic device as claimed in claim 5, wherein: the guard means is secured to the leadframe by induced local melting of the guard means.
Claim 17
Dependent Claim
29 words
A packaged electronic device as claimed in claim 5, wherein: the guard means is provided with at least one aperture to provide access to test points on the leadframe.
Claim 18
Dependent Claim
29 words
A packaged electronic device as claimed in claim 4, wherein: the guard means is provided with at least one aperture to provide access to test points on the leadframe.
Claim 19
Dependent Claim
29 words
A packaged electronic device as claimed in claim 6, wherein: the guard means is provided with at least one aperture to provide access to test points on the leadframe.
Claim 20
Dependent Claim
29 words
A packaged electronic device as claimed in claim 7, wherein: the guard means is provided with at least one aperture to provide access to test points on the leadframe.
Claim 21
Dependent Claim
21 words
A packaged electronic device as claimed in claim 4, wherein: the guard means is formed of a plurality of plastic elements.
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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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |