US2717892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of streptomycin
Assignee: Bristol Laboratories Inc
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Filing: 1952-05-10
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Granted: 1955-09-13
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Expires: 1972-05-10
Abstract
No abstract record available.
Inventors
- 👤 Oliver B Fardig
- 👤 Irving R Hooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:31
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238; A; A61; A61K; A61K38/00; A61K38/04; A61K38/12; C07K; C07K7/00; C07K7/50; C07K7/54; C07K7/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE PROCESS OF REMOVING FROM A MIXTURE OF MANNOSIDOSTREPTOMYCIN AND STREYTOMYCIN ADSORBED ON A CATION EXCHANGE RESIN, AN ELUATE CONTAINING A GREATER PROPORTION OF MANNOSIDOSTREPTOMYCIN THAN THE ORIGINAL MIXTURE, WHICH COMPRISES BRINGING A SOLUTION OF BORIC ACID INTO CONTACT WITH RESIN AND THEN SEPARATING THE LIQUID FROM THE SOLID RESIN.
Claim 2
Dependent Claim
50 words
THE PROCESS OF REMOVING FROM A MIXTURE OF MANNOSIDOSTREPTOMYCIN AND STREYTOMYCIN ADSORBED ON A CATION EXCHANGE RESIN, AN ELUATE CONTAINING A GREATER PROPORTION OF MANNOSIDOSTREPTOMYCIN THAN THE ORIGINAL MIXTURE, WHICH COMPRISES BRINGING A SOLUTION OF BORIC ACID INTO CONTACT WITH RESIN AND THEN SEPARATING THE LIQUID FROM THE SOLID RESIN.
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) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |