US2604385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of growing a crystal
Assignee: Brush Development Co
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Filing: 1947-06-17
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Granted: 1952-07-22
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Expires: 1967-06-17
Abstract
No abstract record available.
Inventors
- 👤 Lawrence B Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:40
CPC Classifications
C; C01; C01D; C01D15/00; C01D15/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
THE METHOD OF PRODUCING A CLEAR SOLID CRYSTAL OF THE SUBSTANCE LITHIUM SULPHATE MONOHYDRATE WHICH COMPRISES: PLANTING A SEED PIECE OF LITHIUM SULPHATE MONOHYDRATE IN A SATURATED WATER SOLUTION OF LITHIUM SULPHATE MONOHYDRATE, INCREASING THE TEMPERATURE OF THE SAID SOLUTION FROM ABOUT 25 DEGREES CENTIGRADE TO ABOUT 85 DEGREES CENTIGRADE OVER A TIME PERIOD OF FROM ABOUT 20 DAYS TO ABOUT 30 DAYS SO THAT SAID SOLUTION BECOMES OVERSATURATED AND THE LITHIUM SULPHATE MONOHYDRATE IN SOLUTION IS CAUSED TO CRYSTALLIZE OUT OF THE SOLUTION ONTO SAID SEED PIECE, AT THE END OF SAID TIME PERIOD PICKING THE GROWN CRYSTAL FROM THE HOT SOLUTION, PLACING SAID PICKED CRYSTAL IN OIL HAVING A TEMPERATURE ABOUT EQUAL TO THE TEMPERATURE OF THE HOT SOLUTION AT THE TIME THE CRYSTAL WAS PICKED, AND COOLING THE OIL AND THE CRYSTAL THEREIN UNTIL THEY REACH ROOM TEMPERATURE.
Claim 2
Independent Claim
141 words
THE METHOD OF PRODUCING A CLEAR SOLID CRYSTAL OF THE SUBSTANCE LITHIUM SULPHATE MONOHYDRATE WHICH COMPRISES: PLANTING A SEED PIECE OF LITHIUM SULPHATE MONOHYDRATE IN A SATURATED WATER SOLUTION OF LITHIUM SULPHATE MONOHYDRATE, INCREASING THE TEMPERATURE OF THE SAID SOLUTION FROM ABOUT 25 DEGREES CENTIGRADE TO ABOUT 85 DEGREES CENTIGRADE OVER A TIME PERIOD OF FROM ABOUT 20 DAYS TO ABOUT 30 DAYS SO THAT SAID SOLUTION BECOMES OVERSATURATED AND THE LITHIUM SULPHATE MONOHYDRATE IN SOLUTION IS CAUSED TO CRYSTALLIZE OUT OF THE SOLUTION ONTO SAID SEED PIECE, AT THE END OF SAID TIME PERIOD PICKING THE GROWN CRYSTAL FROM THE HOT SOLUTION, PLACING SAID PICKED CRYSTAL IN OIL HAVING A TEMPERATURE ABOUT EQUAL TO THE TEMPERATURE OF THE HOT SOLUTION AT THE TIME THE CRYSTAL WAS PICKED, AND COOLING THE OIL AND THE CRYSTAL THEREIN UNTIL THEY REACH ROOM TEMPERATURE.
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) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |