Patent US3248667A successfully refreshed from Google Patents.
US3248667A
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Optical maser comprising the active medium cawo4:tm+3
Assignee: AT&T Inc
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Filing: 1961-11-20
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Granted: 1966-04-26
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Expires: 1981-11-20
Abstract
No abstract record available.
Inventors
- 👤 Leo F Johnson
- 👤 Nassau Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:13
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
AN OPTICAL MASER MATERIAL CONSISTING ESSENTIALLY OF A CRYSTALLINE CALCIUM TUNGSTATE HOST LATTICE IN WHICH A PORTION OF THE CALCIUM IONS HAVE BEEN REPLACED BY THULIUM IONS IN THE TRIVALENT STATE, THE PORTION OF CALCIUM IONS SO REPLACED BEING IN THE RANGE OF FROM ABOUT 0.01 PERCENT TO ABOUT 10 PERCENT.
Claim 2
Dependent Claim
51 words
AN OPTICAL MASER MATERIAL CONSISTING ESSENTIALLY OF A CRYSTALLINE CALCIUM TUNGSTATE HOST LATTICE IN WHICH A PORTION OF THE CALCIUM IONS HAVE BEEN REPLACED BY THULIUM IONS IN THE TRIVALENT STATE, THE PORTION OF CALCIUM IONS SO REPLACED BEING IN THE RANGE OF FROM ABOUT 0.01 PERCENT TO ABOUT 10 PERCENT.
Claim 3
Dependent Claim
51 words
AN OPTICAL MASER COMPRISING A NEGATIVE TEMPERATURE MEDIUM CONSISTING ESSENTIALLY OF THE MATERIAL CLAIMED IN CLAIM 1, MEANS FOR PRODUCING A POPULATION INVERSION BETWEEN A PAIR OF OPTICALLY CONNECTED ENERGY LEVELS OF SAID THULIUM IONS, AND MEANS FOR STIMULATING COHERENT EMISSION AT THE WAVELENGTH CORRESPONDING TO THE SEPARATION OF SAID LEVELS.
References Cited (Backward Citations)
US2929922A
Cited
US3055257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |