Patent US3876467A successfully refreshed from Google Patents.
US3876467A
Expired / Lapsed
US
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Modification of starch
Assignee: Owens Corning
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Filing: 1974-03-18
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Granted: 1975-04-08
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Expires: 1994-03-18
Abstract
Abstract A process for modification of starch under heat and pressure. The modified product is useful as an additive for aqueous resin systems. The process involves heating an aqueous starch mixture in an acid system to a temperature of about 150.degree. to 350.degree.F. in a closed pressure vessel. A pressure of at least 150 pounds per square inch is used. The temperature and pressure are sufficient to initiate a spontaneous reaction accompanied by an increase in pressure. The spontaneous reaction is allowed to proceed until a reaction pressure of at least 500 pounds per square inch is achieved. The reaction mixture is cooled and the modified starch recovered.
Inventors
- 👤 Frank P Mccombs
- 👤 Reuben H Bell
- 👤 Kevin M Foley
- 👤 Jr John D Crecca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:52
CPC Classifications
C; C08; C08B; C08B30/00; C08B30/12; C08B30/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A PROCESS FOR MODIFYING STARCH WHICH COMPRISES THE STEPS OF HEATING STARCH IN AN AQUEOUS ACID SYSTEM IN A CLOSED PRESSURE VESSEL TO A TEMPERATURE OF FROM ABOUT 150* TO 350*F. AT A PRESSURE OF AT LEAST 150 POUNDS PER SQUARE INCH AND FOR A TIME SUFFICIENTLY LONG TO INITIATE A REACTION WHICH CAUSES A SPONTANEOUS PRESSURE INCREASE IN THE VESSEL, ALLOWING THE REACTION TO CONTINUE UNTIL A REACTION PRESSURE OF AT LEAST ABOUT 500 POUNDS PER SQUARE INCH IS REACHED, AND COOLING AND RECOVERING THE REACTION PRODUCT.
Claim 2
Dependent Claim
88 words
A PROCESS FOR MODIFYING STARCH WHICH COMPRISES THE STEPS OF HEATING STARCH IN AN AQUEOUS ACID SYSTEM IN A CLOSED PRESSURE VESSEL TO A TEMPERATURE OF FROM ABOUT 150* TO 350*F. AT A PRESSURE OF AT LEAST 150 POUNDS PER SQUARE INCH AND FOR A TIME SUFFICIENTLY LONG TO INITIATE A REACTION WHICH CAUSES A SPONTANEOUS PRESSURE INCREASE IN THE VESSEL, ALLOWING THE REACTION TO CONTINUE UNTIL A REACTION PRESSURE OF AT LEAST ABOUT 500 POUNDS PER SQUARE INCH IS REACHED, AND COOLING AND RECOVERING THE REACTION PRODUCT.
Claim 3
Dependent Claim
14 words
A process as claimed in claim 1 for modifying starch wherein the acid is
Claim 4
Dependent Claim
12 words
A process as claimed in claim 2 for modifying starch wherein the
Claim 5
Dependent Claim
17 words
A process as claimed in claim 3 for modifying starch wherein; the dibasic acid is adipic acid.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |