US2993041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali-metal phosphate-modified starches
Assignee: International Minerals and Chemical Corp
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Filing: 1957-01-31
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Granted: 1961-07-18
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Expires: 1977-01-31
Abstract
No abstract record available.
Inventors
- 👤 Jacob W Sietsema
- 👤 William C Trotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:12
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/02; C08B31/06; C08B31/066; C08L; C08L3/00; C08L3/04; C08L3/06; D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR TREATING AN ALKALI-METAL PHOSPHATEMODIFIED STARCH AND SEPARATING THEREFROM AN ALKALI-METAL PHOSPHATE-MODIFIED STARCH FRACTION OF INCREASED VISCOSITY WHEN DISPERSED IN WATER, SAID MODIFIED STARCH HAVING BEEN OBTAINED BY REACTION OF STARCH WITH AN ALKALI-METAL ORTHOPHOSPHATE AT A TEMPERATURE BETWEEN ABOUT 120 AND ABOUT 175*C., WHICH COMPRISES DISPERSING SAID ALKALI-METAL PHOSPHATE-MODIFIED STARCH IN WATER, ADDING TO THE RESULTING DISPERSION AN INERT OXYGEN-CONTAINING WATER-MISCIBLE ORGANIC LIQUID SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS, KETONES, AND ETHERS AND MIXTURES THEREOF IN A PROPORTION SUFFICIENTLY HIGH TO PRECIPITATE AN ALKALI-METAL PHOSPHATE-MODIFIED STARCH FRACTION OF HIGHER VISCOSITY IN AQUEOUS DISPERSION THAN THE ORIGINAL MATERIAL WHICH RETAINING UNBOUND INORGANIC SALTS AND LOWER-VISOSITY STARCH FRACTIONS IN THE DISPERSED STATE, AND SEPARATING THE PRECIPITATE FROM THE RESULTING SLURRY.
Claim 2
Dependent Claim
122 words
A PROCESS FOR TREATING AN ALKALI-METAL PHOSPHATEMODIFIED STARCH AND SEPARATING THEREFROM AN ALKALI-METAL PHOSPHATE-MODIFIED STARCH FRACTION OF INCREASED VISCOSITY WHEN DISPERSED IN WATER, SAID MODIFIED STARCH HAVING BEEN OBTAINED BY REACTION OF STARCH WITH AN ALKALI-METAL ORTHOPHOSPHATE AT A TEMPERATURE BETWEEN ABOUT 120 AND ABOUT 175*C., WHICH COMPRISES DISPERSING SAID ALKALI-METAL PHOSPHATE-MODIFIED STARCH IN WATER, ADDING TO THE RESULTING DISPERSION AN INERT OXYGEN-CONTAINING WATER-MISCIBLE ORGANIC LIQUID SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS, KETONES, AND ETHERS AND MIXTURES THEREOF IN A PROPORTION SUFFICIENTLY HIGH TO PRECIPITATE AN ALKALI-METAL PHOSPHATE-MODIFIED STARCH FRACTION OF HIGHER VISCOSITY IN AQUEOUS DISPERSION THAN THE ORIGINAL MATERIAL WHICH RETAINING UNBOUND INORGANIC SALTS AND LOWER-VISOSITY STARCH FRACTIONS IN THE DISPERSED STATE, AND SEPARATING THE PRECIPITATE FROM THE RESULTING SLURRY.
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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) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |