US2689202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of grinding frozen vitamin a material
Assignee: Pfizer Inc
•
Filing: 1951-12-11
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Granted: 1954-09-14
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Expires: 1971-12-11
Abstract
No abstract record available.
Inventors
- 👤 Bavley Abraham
- 👤 Charles J Knuth
- 👤 Wilbur A Lazier
- 👤 Albert E Timreck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:12
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/59; Y; Y10; Y10S; Y10S241/00; Y10S241/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A PROCESS WHICH COMPRISES DISPERSING VITAMIN A IN A SOLUTION OF A WATER-SOLUBLE GELABLE COLLOID CASTING THE DISPERSION INTO THE FORM OF A GELLED SHEET AND DRYING THE SAME, FREEZING THE DRIED SHEET, AND COMMINUTING THE SHEET WHILE FROZEN, IN AN INERT ATMOSPHERE.
Claim 2
Dependent Claim
43 words
A PROCESS WHICH COMPRISES DISPERSING VITAMIN A IN A SOLUTION OF A WATER-SOLUBLE GELABLE COLLOID CASTING THE DISPERSION INTO THE FORM OF A GELLED SHEET AND DRYING THE SAME, FREEZING THE DRIED SHEET, AND COMMINUTING THE SHEET WHILE FROZEN, IN AN INERT ATMOSPHERE.
References Cited (Backward Citations)
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US2380418A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |