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US3737516A
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Calcium-deficient hydroxylapatite for use in column chromatography
Assignee: EIDP Inc
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Filing: 1971-03-05
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Granted: 1973-06-05
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Expires: 1991-03-05
Abstract
Abstract DISCLOSED HEREIN IS GRANULAR CALCIUM-DEFICIENT HYDROXYLAPATITE HAVING A FORMULA WEIGHT RATIO OF CA/PO4 OF BETWEEN ABOUT 1.40 TO 1.50, USEFUL AS A PROTEIN ADSORPTION MEDIUM IN COLUMN CHROMATOGRAPHY. ALSO DISCLOSED IS A ONE-STEP PROCESS COMPRISING CONTACTING UNDER CONTROLLED CONDITIONS AT LEAST ONE OF CALCIUM CHLORIDE, NITRATE OR ACETATE WITH A MIXTURE OF SECONDARY AND TERTIARY ORTHOPHOSPHATE SALTS IN WHICH THE CATION IS SELECTED FROM AT LEAST ONE OF NA+, K+, AND NH4+.
Inventors
- 👤 E Jenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:39
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; C01B25/325; B; B01; B01J; B01J20/00; B01J20/02; B01J20/04; B01J20/048; B01J20/281; B01J20/282; B01J2220/00; B01J2220/50; B01J2220/52
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |