Patent US3257625A successfully refreshed from Google Patents.
US3257625A
Expired / Lapsed
US
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Optical masers comprising the active media srmoo:nd, camoo:nd, and pbmoo:nd
Assignee: AT&T Inc
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Filing: 1961-11-20
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Granted: 1966-06-21
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Expires: 1981-11-20
Abstract
No abstract record available.
Inventors
- 👤 Leo F Johnson
- 👤 Ralph R Soden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:06
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
AN OPTICAL MASER MATERIAL CONSISTING ESSENTIALLY OF A CRYSTALLINE MOLYBDATE HOST LATTICE HAVING A COMPOSITION REPRESENTED ESSENTIALLY BY THE CHEMICALFORMULA XM0O4 WHERE X REPRESENTS A METAL CHOSEN FROM THE GROUP CONSISTING OF LEAD, CALCIUM AND STRONTIUM, IN WHICH A PORTION OF THE X IONS HAVE BEEN REPLACED BY NEODYMIUM IONS IN THE TRIVALENT STATE, THE PORTION OF X IONS SO REPLACED BEING IN THE RANGE OF FROM ABOUT 0.01 PERCENT TO ABOUT 10 PERCENT.
Claim 2
Dependent Claim
74 words
AN OPTICAL MASER MATERIAL CONSISTING ESSENTIALLY OF A CRYSTALLINE MOLYBDATE HOST LATTICE HAVING A COMPOSITION REPRESENTED ESSENTIALLY BY THE CHEMICALFORMULA XM0O4 WHERE X REPRESENTS A METAL CHOSEN FROM THE GROUP CONSISTING OF LEAD, CALCIUM AND STRONTIUM, IN WHICH A PORTION OF THE X IONS HAVE BEEN REPLACED BY NEODYMIUM IONS IN THE TRIVALENT STATE, THE PORTION OF X IONS SO REPLACED BEING IN THE RANGE OF FROM ABOUT 0.01 PERCENT TO ABOUT 10 PERCENT.
Claim 3
Dependent Claim
52 words
AN OPTICAL MASER COMPRISING A NEGATIVE TEMPERATURE MEDIUM CONSISTING ESSENTIALLY OF A MATERIAL CLAIMED IN CLAIM 1, MEANS FOR PRODUCTING A POPULATION INVERSION BETWEEN A PAIR OF OPTICALLY CONNECTED ENERGY LEVELS OF SAID NEODYMIUM IONS, AND MEANS FOR STIMULATING COHERENT EMISSION AT THE WAVELENGTH CORRESPONDING TO THE ENERGY 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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |