US4525171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gradient process of growing crystals from liquid media
Assignee: Knischka Rubine GmbH
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Filing: 1983-03-30
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Granted: 1985-06-25
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Expires: 2003-03-30
Abstract
Abstract In a gradient process of growing crystals from liquid media, the need for mechanical seed holders is eliminated in that a solvent is used which at the instantaneous temperature and under the instantaneous pressure employed in the growing process has a density which is equal or approximately equal to the density of the crystal or crystals which is or are being grown.
Inventors
- 👤 Paul O. Knischka
- 👤 Hans J. Grenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:54
CPC Classifications
C; C30; C30B; C30B9/00; C30B29/00; C30B29/10; C30B29/16; C30B29/20; C30B7/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
50 words
A gradient process of growing crystals from liquid media, comprising growing the crystals in a solvent which at the instantaneous temperature and under the instantaneous pressure employed in the growing process has a density which is equal or approximately equal to the density of the crystals which are being grown.
Claim 2
Dependent Claim
50 words
A gradient process of growing crystals from liquid media, comprising growing the crystals in a solvent which at the instantaneous temperature and under the instantaneous pressure employed in the growing process has a density which is equal or approximately equal to the density of the crystals which are being grown.
Claim 3
Dependent Claim
20 words
The process of claim 1, wherein the solvent is azeotropic at the temperature and pressure employed in the growing process.
References Cited (Backward Citations)
GB680232A
Cited
US2875108A
Cited
FR1293744A
Cited
US3148023A
Cited
US3819335A
Cited
US3714329A
Cited
US3788818A
Cited
US3758705A
Cited
DE2300989A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |