Patent US4867544A successfully refreshed from Google Patents.
US4867544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass elements having a graded refraction index for ir light and method for their production
Assignee: STATE OF ISRAEL ATOMIC ENERGY COMMISSION SOREQ NUCLEAR RESEARCH CENTER OF NAHAL SOREQ YAVNE 70 600 ISRAEL
•
Filing: 1988-08-11
•
Granted: 1989-09-19
•
Expires: 2008-08-11
Abstract
Abstract Optical glass elements with graded refraction index in the infra red region. The elements are made of doped oxygen free chalcogenide glass. The concentration of the dopant decreases from the periphery inward. Typical examples of dopants are As, S and Se. The glass elements are prepared by exposing an oxygen free chalcogenide glass to a molten chemical element or salt at about 150°-400° C. in an oxygen free atmosphere.
Inventors
- 👤 Aharon Bornstein
- 👤 Tsadok Tsalach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:39
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/005; C03C3/00; C03C3/32; C03C3/321; G; G02; G02B; G02B1/00; G02B13/00; G02B13/0095; G02B13/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
An optical glass element having a graded refraction index in the infrared region, consisting essentially of an oxygen-free matrix of a chalcogenide optical glass formed of at least one chalcogenide element selected from the group consisting of S, Se and Te, together with at least one element selected from the group consisting of Al, Ga, Ti, Si, Ge, P, As, Sb, Bi, Br and I doped with at least one suitable doping element whose concentration decreases gradually from at least one face of the periphery inward.
Claim 2
Dependent Claim
86 words
An optical glass element having a graded refraction index in the infrared region, consisting essentially of an oxygen-free matrix of a chalcogenide optical glass formed of at least one chalcogenide element selected from the group consisting of S, Se and Te, together with at least one element selected from the group consisting of Al, Ga, Ti, Si, Ge, P, As, Sb, Bi, Br and I doped with at least one suitable doping element whose concentration decreases gradually from at least one face of the periphery inward.
Claim 3
Dependent Claim
22 words
Optical glass element according to claim 1 wherein said doping element is selected from the group consisting of Ag, S and Se.
Claim 4
Dependent Claim
13 words
Optical glass element according to claim 1 wherein said doping element is Se.
Claim 5
Independent Claim
106 words
A method of making an optical lens element having a graded refraction index in the infrared region, which comprises exposing an oxygen free matrix of a chalcogenide optical glass formed of at least one chalcogenide element selected from the group consisting of S, Se and Te, together with at least one element selected from the group consisting of Al, Ga, Ti, Si, Ge, P, As, Sb, Bi, Br and I to a molten chemical doping element or salt thereof at a temperature of about 150° to about 400° C. in an oxygen-free atmosphere until a desired intrusion depth is obtained and thereafter withdrawing the doped product.
Claim 6
Independent Claim
106 words
A method of making an optical lens element having a graded refraction index in the infrared region, which comprises exposing an oxygen free matrix of a chalcogenide optical glass formed of at least one chalcogenide element selected from the group consisting of S, Se and Te, together with at least one element selected from the group consisting of Al, Ga, Ti, Si, Ge, P, As, Sb, Bi, Br and I to a molten chemical doping element or salt thereof at a temperature of about 150° to about 400° C. in an oxygen-free atmosphere until a desired intrusion depth is obtained and thereafter withdrawing the doped product.
Claim 7
Dependent Claim
11 words
The method of claim 4 wherein the doping element is Se.
Claim 8
Dependent Claim
20 words
Method according to claim 4 wherein said doping element is selected from the group consisting of Ag, S and Se.
References Cited (Backward Citations)
US4371232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |