US4659170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packages for electro-optic devices
Assignee: RCA Corp
•
Filing: 1983-07-29
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Granted: 1987-04-21
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Expires: 2003-07-29
Abstract
Abstract Yttrium aluminum garnet is employed as a light-transmissive window for electro-optic device packages. This material is resistant to high amounts of atomic radiation.
Inventors
- 👤 James P. Wittke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:52
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/50; G; G02; G02B; G02B1/00; G02B1/02; H01; H01S; H01S5/00; H01S5/02; H01S5/022; H01S5/0225; H01S5/02257; H01S5/02208; H01S5/02212; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/8506
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
In a hermetically sealed package for an electro-optic device comprising an electro-optic device mounted on a header and a cap comprising a metal sleeve bonded to a light-transmissive window sealed to the header so that the light-transmissive window is perpendicular to the optical axis of the device, the improvement which comprises employing an yttrium aluminum garnet crystal as the light-transmissive window.
Claim 2
Dependent Claim
61 words
In a hermetically sealed package for an electro-optic device comprising an electro-optic device mounted on a header and a cap comprising a metal sleeve bonded to a light-transmissive window sealed to the header so that the light-transmissive window is perpendicular to the optical axis of the device, the improvement which comprises employing an yttrium aluminum garnet crystal as the light-transmissive window.
Claim 3
Dependent Claim
23 words
A package according to claim 1 wherein the electro-optic device is a semiconductor diode that transmits in the infra-red porion of the spectrum.
Claim 4
Dependent Claim
28 words
A package according to claim 1 wherein the sleeve is made of an iron alloy having a thermal coefficient of expansion about the same as yttrium aluminum garnet.
Claim 5
Dependent Claim
19 words
A package according to claim 1 wherein the yttrium aluminum garnet window is inserted between two iron alloy sleeves.
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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) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |