US2666018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitamin assay medium
Assignee: Armour and Co
•
Filing: 1947-03-08
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Granted: 1954-01-12
•
Expires: 1967-03-08
Abstract
No abstract record available.
Inventors
- 👤 Jr John F Roland
- 👤 Anthony M Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:06
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/02; C12Q1/025; C12N; C12N1/00; C12N1/20; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/853; Y10S435/856
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
IN A PROCESS FOR PREPARING A VITAMIN ASSAY MEDIUM, THE STEPS OF ADDING FERROUS SULFATE TO AN AQUEOUS SOLUTION OF TRYPSIN HYDROLYZED MAMMALIAN LIVER PROTEIN, HEATING THE RESULTING SOLUTION TO FORM AN INSOLUBLE METAL SALT-PROTEIN PRECIPITATE, AND REMOVING THE PRECIPITATE THUS FORMED.
Claim 2
Dependent Claim
42 words
IN A PROCESS FOR PREPARING A VITAMIN ASSAY MEDIUM, THE STEPS OF ADDING FERROUS SULFATE TO AN AQUEOUS SOLUTION OF TRYPSIN HYDROLYZED MAMMALIAN LIVER PROTEIN, HEATING THE RESULTING SOLUTION TO FORM AN INSOLUBLE METAL SALT-PROTEIN PRECIPITATE, AND REMOVING THE PRECIPITATE THUS FORMED.
References Cited (Backward Citations)
US2374503A
Cited
US2400710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |