US4975762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-particle-emitting ceramic composite cover
Assignee: Coors Electronic Package Co
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Filing: 1981-06-11
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Granted: 1990-12-04
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Expires: 2001-06-11
Abstract
Abstract A low alpha-particle-emitting ceramic composite cover which when used in a ceramic integrated circuit package to encapsulate an integrated circuit device, reduces soft errors caused by alpha-particles emitted from the ceramic material. An alpha-particle-absorbing barrier layer is attached to the major portion of the interior surface of the ceramic cover to absorb alpha-particles emitted by the ceramic material. The barrier layer may be an organic polymeric material or an inorganic high purity material. Preferably the barrier layer is a polyimide film which is attached to the ceramic cover by a glass sealant material. Various constructions of the composite cover and ceramic integrated circuit packages utilizing the composite cover are disclosed.
Inventors
- 👤 Norman H. Stradley
- 👤 James A. Woolley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:42
CPC Classifications
H; H10; H10W; H10W42/00; H10W42/20; H10W42/25; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/682; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/851; H10W72/874; H10W72/884; H10W90/00; H10W90/701; H10W90/731; H10W90/734; H10W90/751; H10W90/754
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
A low alpha-particle-emitting composite cover for use in a ceramic integrated circuit package to shield an integrated circuit device from alpha-particles, comprising a ceramic cover coated on the major portion of its interior surface with an alpha-particle-absorbing layer comprising a polyimide organic polymer film adhesively bonded to said ceramic cover said composite cover also comprising a glass sealant adhesive layer between said ceramic cover and said organic polymer film.
Claim 2
Dependent Claim
69 words
A low alpha-particle-emitting composite cover for use in a ceramic integrated circuit package to shield an integrated circuit device from alpha-particles, comprising a ceramic cover coated on the major portion of its interior surface with an alpha-particle-absorbing layer comprising a polyimide organic polymer film adhesively bonded to said ceramic cover said composite cover also comprising a glass sealant adhesive layer between said ceramic cover and said organic polymer film.
Claim 3
Dependent Claim
95 words
A low alpha-particle-emitting ceramic composite cover for use in ceramic integrated circuit packages to shield said integrated circuit device from alpha particles, comprising a ceramic cover, an alpha-absorbing layer barrier layer coated on the major portion of the interior surface of said ceramic cover, and a glass sealant layer disposed between said barrier layer and said interior surface of said ceramic cover, said barrier layer comprising a polyimide film, and said composite cover being capable of withstanding temperatures of up to about 450° C. without delmamination of said polyimide film from said glass sealant layer.
Claim 4
Dependent Claim
95 words
A low alpha-particle-emitting ceramic composite cover for use in ceramic integrated circuit packages to shield said integrated circuit device from alpha particles, comprising a ceramic cover, an alpha-absorbing layer barrier layer coated on the major portion of the interior surface of said ceramic cover, and a glass sealant layer disposed between said barrier layer and said interior surface of said ceramic cover, said barrier layer comprising a polyimide film, and said composite cover being capable of withstanding temperatures of up to about 450° C. without delmamination of said polyimide film from said glass sealant layer.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |