Patent US1069854A successfully refreshed from Google Patents.
Patent US4975762A successfully refreshed from Google Patents.
US4975762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-particle-emitting ceramic composite cover
Assignee: Coors Electronic Package Co
•
Filing: 1981-06-11
•
Granted: 1990-12-04
•
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 19:54
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.
References Cited (Backward Citations)
US2966719A
Cited
US3549784A
Cited
US3864810A
Cited
US4017886A
Cited
US3926746A
Cited
US4040083A
Cited
US4224637A
Cited
JPS5552245A
Cited
GB2036428A
Cited
GB2039145A
Cited
US4323405A
Cited
JPS5593239A
Cited
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 |