Patent US3694149A successfully refreshed from Google Patents.
US3694149A
Expired / Lapsed
US
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Purified blue colored inorganic macromolecular complex compounds
Assignee: KITAZATO GAKUEN
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Filing: 1970-03-30
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Granted: 1972-09-26
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Expires: 1990-03-30
Abstract
Abstract INTENSELY COLORED INORGANIC MACROMOLECULAR COMPLEX COMPOUNDS OR THE SOLUTION THEREOF FOR USE IN DETERMINING THE VOID VOLUME (VO) OF THE GEL COLUMN ARE PROVIDED BY A PROCESS WHEREIN THE CRUDE SOLUTION OF THE SO-CALLED SOLUBLE PRUSSIAN BLUE OR THE REACTION SOLUTION RESULTING FROM THE MIXTURE OF CHROMIUM (III) SALT AND ALKALI FERROCYCANIDE IS PURIFIED MACROMOLECULOLOGICALLY, THAT IS, PURIFIED TO PROVIDE THE MACOMOLECULAR SUBSTANCE POSSESSING THE DESIRED RANGE OF MAGNITUDE OF MOLECULAR SIZE, BY MEANS OF GEL CHROMATOGRAPHY WHICH COMPRISES A FUNCTION OF MOLECULAR SIEVE, OR ALTERNATIVELY, BY MEANS OF A SALTING OUT PROCEDURE.
Inventors
- 👤 Yoshio Matsumoto
- 👤 Michiko Shirai
- 👤 Hiroko Saito
- 👤 Takeshi Kawashima
- 👤 Yuzuru Sakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:15
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/08; C01C3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |