US3051656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing magnetic garnet crystals
Assignee: Individual
•
Filing: 1959-05-08
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Granted: 1962-08-28
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Expires: 1979-05-08
Abstract
No abstract record available.
Inventors
- 👤 Kramarsky Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2641
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
THE METHOD OF GROWING MAGNETIC IRON RARE-EARTH GARNET CRYSTALS, COMPRISING THE STEPS OF PROVIDING A MIXTURE OF IRON OXIDE, FROM 25 TO 70 MOLE PERCENT, LEAD OXIDE, FROM 30 TO 70 MOLE, PERCENT, RARE-EARTH OXIDE, FROM 0.1 TO 10 MOLE PERCENT, THE RARE EARTH BEING SELECTED FROM THE GROUP CONSISTING OF YTTRIUM, GADOLINIUM, ERBIUM AND SAMARIUM, AND BORIC ANHYDRIDE, FROM 2 TO 15 MOLE PERCENT, HEATING SAID MIXTURE TO A TEMPERATURE IN THE RANGE OF 1315 TO 1345 DEGREES CENTIGRADE, AND THEN COOLING, SAID HEATED MIXTURE AT A COMTROLLED, RATE IN THE RANGE OF 0.5 TO 5 DEGREES CENTIGRADE PER HOUR TO ALLOW FOR PROPER CRYSTAL GROWTH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |