Patent US3390750A successfully refreshed from Google Patents.
US4453033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead grounding
Assignee: ISOTRONICS Inc NEW BEDFORD MA A DE CORP
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Filing: 1982-03-18
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Granted: 1984-06-05
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Expires: 2002-03-18
Abstract
Abstract A microcircuit package in which one or more leads can be grounded to the package by a simple procedure which is performed on a package of usual construction. A braze preform is placed over a lead to be grounded, a metal washer is disposed over the lead and preform, and the assembly is brazed to cause fusing of the washer to the lead and to the header to provide a low resistance grounding connection between the lead and package.
Inventors
- 👤 Raymond J. Duff
- 👤 Steven A. Tower
- 👤 Jay S. Greenspan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:11
CPC Classifications
H; H05; H05K; H05K5/00; H05K5/0091; H01; H01R; H01R4/00; H01R4/58; H01R4/64; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49208; Y10T29/4921; Y10T29/49211; Y10T29/49213; Y10T29/49222
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
164 words
In a microcircuit package which includes a conductive header and a plurality of leads each extending through a respective opening and retained in the opening and electrically insulated from the header by glass seals, means for grounding one or more leads to the header comprising for each such lead: a braze preform ring disposed over the lead and having an opening to slidably fit over the lead, and sufficient material to provide a braze fillet; a metal washer disposed around the lead and supported on the preform ring, the metal washer having an opening to slidably fit over the lead and an outside diameter larger than that of the header opening to provide a peripheral surface in contact with the confronting peripheral surface of the header; the metal washer being of a metal compatible with that of the header material; the package being brazable to cause fusing of the washer to the lead and to the header to provide a low resistance grounding connection.
Claim 2
Dependent Claim
164 words
In a microcircuit package which includes a conductive header and a plurality of leads each extending through a respective opening and retained in the opening and electrically insulated from the header by glass seals, means for grounding one or more leads to the header comprising for each such lead: a braze preform ring disposed over the lead and having an opening to slidably fit over the lead, and sufficient material to provide a braze fillet; a metal washer disposed around the lead and supported on the preform ring, the metal washer having an opening to slidably fit over the lead and an outside diameter larger than that of the header opening to provide a peripheral surface in contact with the confronting peripheral surface of the header; the metal washer being of a metal compatible with that of the header material; the package being brazable to cause fusing of the washer to the lead and to the header to provide a low resistance grounding connection.
Claim 3
Dependent Claim
42 words
The invention of claim 1 wherein the microcircuit package includes a plurality of leads each of circular cross-section; and wherein the braze preform ring and metal washer each have an opening with an inside diameter to slidably fit over each such lead.
Claim 4
Dependent Claim
14 words
The invention of claim 1 wherein the microcircuit package is a dual in-line package.
Claim 5
Dependent Claim
14 words
The invention of claim 1 wherein the braze preform ring is a gold/germanium alloy.
Claim 6
Dependent Claim
14 words
The invention of claim 1 wherein the braze preform ring is a gold/tin alloy.
Claim 7
Dependent Claim
35 words
The invention of claim 1 wherein the metal washer is selected from the group of metals consisting of nickel, copper, and an alloy consisting of 17 percent cobalt, 54 percent iron, and 29 percent nickel.
Claim 8
Dependent Claim
47 words
The invention of claim 1 wherein the microcircuit package includes a glass seal having a protruding portion which outwardly extends along the length of the lead; and wherein the braze preform ring and metal washer each have a flared cross-section which conforms to the protruding glass seal.
Claim 9
Dependent Claim
37 words
The invention of claim 1 wherein the microcircuit package includes a flat pack having leads of rectangular cross-section; and wherein the metal washer has an opening of rectangular configuration conforming to and slidably fitting over the lead.
Claim 10
Dependent Claim
163 words
In a method for grounding one or more leads to a header of a microcircuit package of a type which includes a conductive header and a plurality of leads each extending through its respective opening and retained in the opening and electrically insulated from the header by glass seals, the steps of: disposing over each lead to be grounded a braze preform ring having an opening to slidably fit over the lead and sufficient material to provide a braze fillet; disposing over each lead to be grounded a metal washer having an opening to slidably fit over the lead and an outside diameter greater than that of the header opening to provide a peripheral surface in contact with the confronting peripheral surface of the header, the metal washer being of a metal compatible with that of the header material; and brazing the package to cause fusing of the washer to the lead and to the header to provide a low resistance grounding connection.
Claim 11
Dependent Claim
163 words
In a method for grounding one or more leads to a header of a microcircuit package of a type which includes a conductive header and a plurality of leads each extending through its respective opening and retained in the opening and electrically insulated from the header by glass seals, the steps of: disposing over each lead to be grounded a braze preform ring having an opening to slidably fit over the lead and sufficient material to provide a braze fillet; disposing over each lead to be grounded a metal washer having an opening to slidably fit over the lead and an outside diameter greater than that of the header opening to provide a peripheral surface in contact with the confronting peripheral surface of the header, the metal washer being of a metal compatible with that of the header material; and brazing the package to cause fusing of the washer to the lead and to the header to provide a low resistance grounding connection.
References Cited (Backward Citations)
US3311798A
Cited
US3548076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |