Patent US2857377A successfully refreshed from Google Patents.
US2857377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amylaceous esters of sulfamic acid
Assignee: NAT STARCH PRODUCTS Inc
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Filing: 1956-05-11
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Granted: 1958-10-21
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Expires: 1976-05-11
Abstract
No abstract record available.
Inventors
- 👤 Martin Irving
- 👤 Otto B Wurzburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:24
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/02; C08B31/06; C08B31/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
THE METHOD OF PRODUCING THE SULFATE ESTER OF AN AMYLACEOUS MATERIAL IN A SUBSTANTIALLY UNGRELATINIZED STATE WHICH COMPRISES INPREGNATING AN UNGELATINIZED AMYLACEOUS MATERIAL WITH SULFAMIC ACID AND AN AMIDE, AND HEATING THE MIX AT A MOISTURE CONTENT OF LESS THAN 50% AND AT TEMPERATURES IN THE APPROXIMATE RANGE OF 100* C. TO 300*C. UNTIL A REACTION BETWEEN THE AMYLOCEOUS MATERIAL AND THE SULFAMIC ACID HAS OCCURRED TO PRODUCE THE SUBSTANTIALLY UNGELATINIZED AMYLACEOUS ESTER, THE AMOUNT OF MOISTURE PRESENT DURING SAID HEATING BEING LESS THAN THAT WHICH WOULD PERMIT GELATINIZATION OF THE AMYLACEOUS MATERIAL ON THE REACTION MASS, THE AMOUNT OF SULFAMIC ACID USED BEING BETWEEN APPROXIMATELY 3% AND APPROXIMATELY 20%, AND THE AMOUNT OF AMIDE BEING BETWEEN APPROXIMATELY 5% AND APPROXIMATELY 45% BOTH BASED ON TEH ANHYDROUS WEIGHT OF THE AMYLACEOUS MATERIAL, AND THE RATIO OF AMIDE TO SULFAMIC ACID BEING BETWEEN 1:1 AND 8:1.
Claim 2
Independent Claim
145 words
THE METHOD OF PRODUCING THE SULFATE ESTER OF AN AMYLACEOUS MATERIAL IN A SUBSTANTIALLY UNGRELATINIZED STATE WHICH COMPRISES INPREGNATING AN UNGELATINIZED AMYLACEOUS MATERIAL WITH SULFAMIC ACID AND AN AMIDE, AND HEATING THE MIX AT A MOISTURE CONTENT OF LESS THAN 50% AND AT TEMPERATURES IN THE APPROXIMATE RANGE OF 100* C. TO 300*C. UNTIL A REACTION BETWEEN THE AMYLOCEOUS MATERIAL AND THE SULFAMIC ACID HAS OCCURRED TO PRODUCE THE SUBSTANTIALLY UNGELATINIZED AMYLACEOUS ESTER, THE AMOUNT OF MOISTURE PRESENT DURING SAID HEATING BEING LESS THAN THAT WHICH WOULD PERMIT GELATINIZATION OF THE AMYLACEOUS MATERIAL ON THE REACTION MASS, THE AMOUNT OF SULFAMIC ACID USED BEING BETWEEN APPROXIMATELY 3% AND APPROXIMATELY 20%, AND THE AMOUNT OF AMIDE BEING BETWEEN APPROXIMATELY 5% AND APPROXIMATELY 45% BOTH BASED ON TEH ANHYDROUS WEIGHT OF THE AMYLACEOUS MATERIAL, AND THE RATIO OF AMIDE TO SULFAMIC ACID BEING BETWEEN 1:1 AND 8:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |