Patent US4520116A successfully refreshed from Google Patents.
US4520116A
Expired / Lapsed
US
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Transparent aluminum oxynitride and method of manufacture
Assignee: Surmet Corp
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Filing: 1984-01-13
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Granted: 1985-05-28
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Expires: 2004-01-13
Abstract
Abstract An article of manufacture is provided comprising a polycrystalline cubic aluminum oxynitride having a density of at least 98% of theoretical density, and being transparent to electromagnetic radiation in the wavelength range from 0.3 to 5 micrometers with an in-line transmission of at least 20% in this range. A method of preparing the optically transparent aluminum oxynitride is also provided comprising the steps of forming a green body of substantially homogeneous aluminum oxynitride powder and pressureless sintering said green body in a nitrogen atmosphere and in the presence of predetermined additives which enhance the sintering process. Preferred additives are boron and yttrium in elemental or compound form.
Inventors
- 👤 Richard L. Gentilman
- 👤 Edward A. Maguire
- 👤 Leonard E. Dolhert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581; Y; Y10; Y10S; Y10S264/00; Y10S264/91; Y10S501/00; Y10S501/90; Y10S501/904
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
44 words
A body of polycrystalline cubic aluminum oxynitride having a density greater than 97.2% of theoretical density, a sample of said body having an in-line transmission of at least 20% in the wavelength range of 0.3-5 microns said sample having a thickness of 1.90 millimeters.
Claim 2
Dependent Claim
44 words
A body of polycrystalline cubic aluminum oxynitride having a density greater than 97.2% of theoretical density, a sample of said body having an in-line transmission of at least 20% in the wavelength range of 0.3-5 microns said sample having a thickness of 1.90 millimeters.
Claim 3
Dependent Claim
42 words
A body of polycrystalline doped cubic aluminum oxynitride material having a density greater than 97.2%, a sample of said body having an in-line transmission of at least 20% in the 0.3-5 micron wavelength range, said sample having a thickness of 1.90 millimeters.
Claim 4
Dependent Claim
42 words
A body of polycrystalline doped cubic aluminum oxynitride material having a density greater than 97.2%, a sample of said body having an in-line transmission of at least 20% in the 0.3-5 micron wavelength range, said sample having a thickness of 1.90 millimeters.
Claim 5
Dependent Claim
27 words
The aluminum oxynitride body of claim 2 wherein: said aluminum oxynitride body is formed of substantially single phase aluminum oxynitride and is doped with boron and yttrium.
Claim 6
Dependent Claim
18 words
The aluminum oxynitride body of claim 3 wherein: said body has an average grain size of 200 microns.
Claim 7
Dependent Claim
24 words
The body of aluminum oxynitride of claim 1 wherein the sample of said body has an optical resolving angle of less than 3 mrad.
Claim 8
Dependent Claim
16 words
A body of polycrystalline cubic aluminum oxynitride having a density greater than 99% of theoretical density.
Claim 9
Dependent Claim
16 words
A body of polycrystalline cubic aluminum oxynitride having a density greater than 99% of theoretical density.
Claim 10
Dependent Claim
17 words
A body of polycrystalline doped cubic aluminum oxynitride having a density greater than 99% of theoretical density.
Claim 11
Dependent Claim
17 words
A body of polycrystalline doped cubic aluminum oxynitride having a density greater than 99% of theoretical density.
Claim 12
Dependent Claim
20 words
The body of aluminum oxynitride of claim 7 wherein said aluminum oxynitride body is formed of substantially single-phase aluminum oxynitride.
Claim 13
Dependent Claim
19 words
The body of aluminum oxynitride of claim 8 wherein said aluminum oxynitride body is doped with boron and yttrium.
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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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |