Patent US2575352A successfully refreshed from Google Patents.
US2575352A
Expired / Lapsed
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Phosphates of amylaceous polysaccharides
Assignee: Individual
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Filing: 1949-03-25
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Granted: 1951-11-20
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Expires: 1969-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Rolland L Lohmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:28
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/02; C08B31/06; C08B31/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A METHOD FOR PREPARING PHOSPHORUS DERIVATIVES OF AMYLACEOUS POLYSACCHARIDES, WHICH RESULTS IN A PHOSPHORYLATED POLYSACCHARIDE THAT IS INSOLUBLE IN NEUTRAL, WEAKLY ACIDIC, AND WEAKLY BASIC HOT AND COLD AQUEOUS MEDIA AND WHICH IS RESISTANT TO SWELLING IN HOT WATER, COMPRISING: TREATING THE AMYLACEOUS POLYSACCHARIDE MATERIAL WITH A MEDIUM SUBSTANTIALLY CONSISTING OF PYRIDINE AT A TEMPERATURE WITHIN THE RANGE OF 50* C. TO 115* C. AND REACTING THE THUS TREATED MATERIAL WITH A PHOSPHOROUS OXYHALIDE IN A MEDIUM COMPRISING DRY PYRIDINE AT A TEMPERATURE WITHIN THE RANGE OF 40* C. TO 115* C. FOR A PERIOD OF TIME IN EXCESS OF 15 MINUTES AND RECOVERING THE PHOSPHORYLATED PRODUCT.
Claim 2
Independent Claim
107 words
A METHOD FOR PREPARING PHOSPHORUS DERIVATIVES OF AMYLACEOUS POLYSACCHARIDES, WHICH RESULTS IN A PHOSPHORYLATED POLYSACCHARIDE THAT IS INSOLUBLE IN NEUTRAL, WEAKLY ACIDIC, AND WEAKLY BASIC HOT AND COLD AQUEOUS MEDIA AND WHICH IS RESISTANT TO SWELLING IN HOT WATER, COMPRISING: TREATING THE AMYLACEOUS POLYSACCHARIDE MATERIAL WITH A MEDIUM SUBSTANTIALLY CONSISTING OF PYRIDINE AT A TEMPERATURE WITHIN THE RANGE OF 50* C. TO 115* C. AND REACTING THE THUS TREATED MATERIAL WITH A PHOSPHOROUS OXYHALIDE IN A MEDIUM COMPRISING DRY PYRIDINE AT A TEMPERATURE WITHIN THE RANGE OF 40* C. TO 115* C. FOR A PERIOD OF TIME IN EXCESS OF 15 MINUTES AND RECOVERING THE PHOSPHORYLATED PRODUCT.
References Cited (Backward Citations)
US1129321A
Cited
US2372337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |