Patent US3771065A successfully refreshed from Google Patents.
US3771065A
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Tunable internal-feedback liquid crystal-dye laser
Assignee: United States Department of the Navy
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Filing: 1972-08-09
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Granted: 1973-11-06
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Expires: 1992-08-09
Abstract
Abstract A liquid lasing medium having internal distributed feedback by virtue of the molecular structure of a cholesteric liquid crystal material, said medium comprising a mixture of a strongly fluorescent dye, 7-diethyl-4-methyl coumarin, and a cholesteric liquid crystal solution of 40 percent cholesteryl oleyl carbonate, 30 percent cholesteryl chloride and 30 percent cholesteryl monanoate.
Inventors
- 👤 L Goldberg
- 👤 J Schnur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0045; H; H01; H01S; H01S3/00; H01S3/14; H01S3/20; H01S3/213; H01S3/16; H01S3/1686
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
17 words
A liquid lasing medium as in claim 1, in which: said dye comprises the material 7-Diethyl-4-methyl coumarin.
Claim 2
Dependent Claim
33 words
A liquid lasing medium as in claim 1, in which: said cholesteric liquid crystal comprises a solution formed from 40 percent cholesteryl oleyl carbonAte, 30 percent cholesteryl chloride and 30 percent cholesteryl nonanoate.
Claim 3
Dependent Claim
42 words
In a laser, a liquid lasing medium comprising a mixture of: injecting fluorescent dye means for absorbing radiant energy of one wavelength and emitting light of a different wavelength; cholesteric liquid crystal means for providing internal distributed feedback for the lasing light.
Claim 4
Dependent Claim
14 words
A medium as in claim 4, wherein said fluorescent dye means comprises 7-Diethyl-4-methyl coumarin.
Claim 5
Dependent Claim
33 words
A medium as in claim 4, wherein said liquid means for providing internal distributed feedback comprises a solution of 40 percent cholesteryl oleyl carbonate, 30 percent cholesteryl chloride, and 30 percent cholesteryl nonanoate.
References Cited (Backward Citations)
US3627408A
Cited
US3726584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |