Patent US3981818A successfully refreshed from Google Patents.
US3981818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline materials
Assignee: Solon Technologies Inc
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Filing: 1973-10-15
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Granted: 1976-09-21
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Expires: 1993-10-15
Abstract
Abstract A composition of matter transparent to infrared rays and shock resistant which is a directionally grown, polycrystalline solidified melt of a eutectic composition comprising at least two components wherein the ratio of the index of refraction of one to the other is within the range of 1.2 to 1.0, the directionally oriented, polycrystalline mass is grown in a controlled manner by adding heat to the melt and removing the same from the solids during the solidification step, the amount of heat being added to the melt and conducted through the solidified melt being 103 to 105 times the latent heat of fusion of the eutectic mixture.
Inventors
- 👤 Carl F. Swinehart
- 👤 Marko Sfiligoj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:14
CPC Classifications
C; C30; C30B; C30B21/00; C30B21/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A process for making an infrared transmitting non-cleaving, cooled and solidified melt comprising the steps of mixing two infrared-transparent solid components capable of forming a eutectic in proportions to yield approximately the eutectic mixture, heating the mixture to form a melt of the two solid phases, solidifying the melt in a controlled manner by adding heat to the melt and removing same from the solids during said solidification step, the amount of heat being added to the melt and conducted through the solidifying melt is 10 3 to 10 5 times the latent heat of fusion of said eutectic mixture, and cooling the solid mixture.
Claim 2
Dependent Claim
105 words
A process for making an infrared transmitting non-cleaving, cooled and solidified melt comprising the steps of mixing two infrared-transparent solid components capable of forming a eutectic in proportions to yield approximately the eutectic mixture, heating the mixture to form a melt of the two solid phases, solidifying the melt in a controlled manner by adding heat to the melt and removing same from the solids during said solidification step, the amount of heat being added to the melt and conducted through the solidifying melt is 10 3 to 10 5 times the latent heat of fusion of said eutectic mixture, and cooling the solid mixture.
Claim 3
Dependent Claim
79 words
The process according to claim 1 further characterized in that each component is made up of a metal and an anion, said metal having been chosen from the group consisting of aluminum, barium, cadmium, calcium, cesium, chromium, cobalt, copper, iron, lithium, magnesium, molybdenum, potassium, rubidium, silver, sodium, strontium, titanium, zinc, and zirconium, and said anion having been chosen from the group consisting of hydroxyl, carbonate, sulfate, nitrate, sulfide, fluoride, chloride, bromide, iodide, cyanide, thiocyanate, chlorate, iodate, phosphate and tungstate.
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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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |