US3225306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical maser using trivalent neodymium ions in a calcium tungstate host lattice
Assignee: AT&T Inc
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Filing: 1961-09-19
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Granted: 1965-12-21
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Expires: 1981-09-19
Abstract
No abstract record available.
Inventors
- 👤 Leo F Johnson
- 👤 Nassau Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:33
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
AN OPTICAL MASER COMPRISING A NEGATIVE TEMPERATURE MEDIUM CONSISTING ESSENTIALLY OF A SUBSTANTIALLY MONOCRYSTALLINE CALCIUM TUNGSTATE HOST LATTICE IN WHICH A PORTION OF THE CALCIUM IONS HAVE BEEN REPLACED BY NEODYMIUM IONS IN THE TRIVALENT STATE, THE PORTION OF CALCIUM IONS SO REPLACED BEING IN THE RANGE OF FROM 0.01 PERCENT TO 5 PERCENT, MEANS FOR PRODUCING A POPULATION INVERSION BETWEEN A PAIR OF OPTICALLY CONNECTED ENERGYLEVELS OF SAID NEODYMIUMIONS, AND MEANS FOR SIMULATING COHERENT EMISSION AT THE WAVELENGTH CORRESPONDING TO THE ENERGY SEPARATION OF SAID LEVELS.
Claim 2
Dependent Claim
87 words
AN OPTICAL MASER COMPRISING A NEGATIVE TEMPERATURE MEDIUM CONSISTING ESSENTIALLY OF A SUBSTANTIALLY MONOCRYSTALLINE CALCIUM TUNGSTATE HOST LATTICE IN WHICH A PORTION OF THE CALCIUM IONS HAVE BEEN REPLACED BY NEODYMIUM IONS IN THE TRIVALENT STATE, THE PORTION OF CALCIUM IONS SO REPLACED BEING IN THE RANGE OF FROM 0.01 PERCENT TO 5 PERCENT, MEANS FOR PRODUCING A POPULATION INVERSION BETWEEN A PAIR OF OPTICALLY CONNECTED ENERGYLEVELS OF SAID NEODYMIUMIONS, AND MEANS FOR SIMULATING 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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |