US2824870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea-modified alkali metal starch phosphates
Assignee: International Minerals and Chemical Corp
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Filing: 1954-09-16
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Granted: 1958-02-25
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Expires: 1974-09-16
Abstract
No abstract record available.
Inventors
- 👤 Neukom Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:39
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/02; C08B31/06; C08B31/066
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
157 words
IN A PROCESS FOR PREPARING AN ALKALI-METAL STARCH PHOSPHATE, WHICH PROCESS COMPRISES COMMINGLING STARCH WITH AN AQUEOUS SOLUTION CONTAINING AT LEAST ABOUT 2.5% BY WEIGHT OF AN ALKALI-METAL PHOSPHATE AND HAVING A PH BETWEEN ABOUT 3.0 AND ABOUT 8.0, THE PROPORTION OF STARCH BEING LESS THAN ABOUT 11/2 TIMES THE WEIGHT OF WATER PRESENT IN SAID SOLUTION, AGITATING THE RESULTING SLURRY FOR AT LEAST ABOUT 5 MINUTES, SEPARTTING THE TREATED STARCH FROM THE LIQUID PHASE, DRYING THE SURFACE MOISTURE FROM THE TREATED STARCH AT A TEMPERATURE BELOW THE POINT AT WHICH THE STARCH GELATINIZES, AND HEATING THE TREATED STARCH AT A TEMPERATURE BETWEEN ABOUT 120 AND ABOUT 175*C. FOR BETWEEN ABOUT 1 AND ABOUT 15 HOURS, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN SAID AQUEOUS SOLUTION BETWEEN ABOUT 2 AND ABOUT 5% BY WEIGHT OF UREA PRIOR TO TREATMENT OF STARCH THEREWITH, WHEREBY A UREA-MODIFIED ALKALI-METAL STARCH PHOSPHATE IS OBTAINED CAPABLE OF PRODUCING AQUEOUS SOLUTIONS OF ININCREASED VISCOSITY.
Claim 2
Dependent Claim
157 words
IN A PROCESS FOR PREPARING AN ALKALI-METAL STARCH PHOSPHATE, WHICH PROCESS COMPRISES COMMINGLING STARCH WITH AN AQUEOUS SOLUTION CONTAINING AT LEAST ABOUT 2.5% BY WEIGHT OF AN ALKALI-METAL PHOSPHATE AND HAVING A PH BETWEEN ABOUT 3.0 AND ABOUT 8.0, THE PROPORTION OF STARCH BEING LESS THAN ABOUT 11/2 TIMES THE WEIGHT OF WATER PRESENT IN SAID SOLUTION, AGITATING THE RESULTING SLURRY FOR AT LEAST ABOUT 5 MINUTES, SEPARTTING THE TREATED STARCH FROM THE LIQUID PHASE, DRYING THE SURFACE MOISTURE FROM THE TREATED STARCH AT A TEMPERATURE BELOW THE POINT AT WHICH THE STARCH GELATINIZES, AND HEATING THE TREATED STARCH AT A TEMPERATURE BETWEEN ABOUT 120 AND ABOUT 175*C. FOR BETWEEN ABOUT 1 AND ABOUT 15 HOURS, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN SAID AQUEOUS SOLUTION BETWEEN ABOUT 2 AND ABOUT 5% BY WEIGHT OF UREA PRIOR TO TREATMENT OF STARCH THEREWITH, WHEREBY A UREA-MODIFIED ALKALI-METAL STARCH PHOSPHATE IS OBTAINED CAPABLE OF PRODUCING AQUEOUS SOLUTIONS OF ININCREASED VISCOSITY.
Claim 3
Dependent Claim
47 words
A UREA-MODIFIED ALKALI-METAL STARCH PHOSPHATE, PREPARED ACCORDING TO THE METHOD OF CLAIM 1, AND CONTAINING BETWEEN ABOUT 1 AND ABOUT 5% BY WEIGHT OF BOUND PHOSPHORUS, BASED ON THE ORIGINAL STARCH, AND BETWEEN ABOUT 1 AND ABOUT 2 MOLES OF ALKALI METAL PER MOLE OF BOUND PHOSPHORUS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |