US4356721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass lead seal test apparatus
Assignee: United States Department of the Army
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Filing: 1980-12-19
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Granted: 1982-11-02
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Expires: 2000-12-19
Abstract
Abstract Glass lead seal test apparatus in which a multiplicity of microcircuit pages with the leads sealed relative thereto by glass are checked for leakage between the glass seals and the microcircuit package structure and relative to the leads; this is accomplished by providing an apparatus for evacuating a chamber of the microcircuit packages and a chamber of the apparatus, and then injecting helium into the chamber of the apparatus and then utilizing test structure to test leakage around the glass seals if a perfect seal is not present. The device is designed to handle a multiplicity of microcircuit packages during a given test cycle.
Inventors
- 👤 James W. White
- 👤 Victor W. Ruwe
- 👤 Donald R. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:01
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/22; G01M3/223
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
329 words
Glass lead seal test apparatus comprising a base member, seal means mounted on the base member, a cover mounted to the base and being moveable into and out of sealing relationship with said seal means and defining a chamber with said seal means, a clamp down assembly removably mounted relative to said base and being adapted for clamping microcircuit packages into sealing relationship with said seal means with said microcircuit packages having leads therein with glass seals between each lead and the structure of the microcircuit package and defining a chamber with said seal means, said base member having first passage means for communicating with the chamber defined by said microcircuit package and said seal means, a second passage means through said base member and communicating with said chamber defined by said cover and said seal means, first control means connected to said first and second passage means for pulling a vacuum on the chamber of said microcircuit package and said chamber defined by said cover and said seal means, second control means connected to said second passage means and adapted for filling said chamber defined by said cover and said seal means with an inert gas, second control means connected with said first passage means for pulling a vacuum thereon and having means for testing for any leakage of said inert gas leaking past said glass lead seals into said chamber defined by said microcircuit package and said seal means and into said first passage means, said clamp down assembly being designed to clamp a multiplicity of microcircuit packages in sealing relationship with said seal means to define a chamber between each microcircuit package and said seal means and said first passage means including a multiplicity of passages with an individual passage communicating with a respective chamber of a microcircuit package, and said means for testing including means for individually switching from the chamber of each microcircuit package to the other until all microcircuit packages have been tested.
Claim 2
Dependent Claim
329 words
Glass lead seal test apparatus comprising a base member, seal means mounted on the base member, a cover mounted to the base and being moveable into and out of sealing relationship with said seal means and defining a chamber with said seal means, a clamp down assembly removably mounted relative to said base and being adapted for clamping microcircuit packages into sealing relationship with said seal means with said microcircuit packages having leads therein with glass seals between each lead and the structure of the microcircuit package and defining a chamber with said seal means, said base member having first passage means for communicating with the chamber defined by said microcircuit package and said seal means, a second passage means through said base member and communicating with said chamber defined by said cover and said seal means, first control means connected to said first and second passage means for pulling a vacuum on the chamber of said microcircuit package and said chamber defined by said cover and said seal means, second control means connected to said second passage means and adapted for filling said chamber defined by said cover and said seal means with an inert gas, second control means connected with said first passage means for pulling a vacuum thereon and having means for testing for any leakage of said inert gas leaking past said glass lead seals into said chamber defined by said microcircuit package and said seal means and into said first passage means, said clamp down assembly being designed to clamp a multiplicity of microcircuit packages in sealing relationship with said seal means to define a chamber between each microcircuit package and said seal means and said first passage means including a multiplicity of passages with an individual passage communicating with a respective chamber of a microcircuit package, and said means for testing including means for individually switching from the chamber of each microcircuit package to the other until all microcircuit packages have been tested.
Claim 3
Dependent Claim
35 words
Glass lead seal test apparatus as defined in claim 1, wherein said inert gas is helium, wherein said means for testing also include a nitrogen coldtrap and a mass spectrometer that are connected in series.
Claim 4
Dependent Claim
47 words
Glass lead seal test apparatus as defined in claim 2, wherein said means for testing also includes means which indicate the particular microcircuit package being tested and means for marking a particular microcircuit package when it is found to have a glass lead seal that is leaking.
References Cited (Backward Citations)
US3416359A
Cited
US3762212A
Cited
DE2135751A1
Cited
US3914983A
Cited
GB2000300A
Cited
US4158960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |