US2993015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous composition prepared by reacting a dextran modified polyester with naphthalene diisocyanate and method of making same
Assignee: Commonwealth Engineering Company of Ohio
•
Filing: 1960-02-29
•
Granted: 1961-07-18
•
Expires: 1980-02-29
Abstract
No abstract record available.
Inventors
- 👤 Leo J Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/68; C08G18/683
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE METHOD OF MAKING A RESINOUS COMPOSITION WHICH COMPRISES MIXING AND REACTING A MIXTURE OF CONSTITUENTS IN PARTS BY WEIGHT OF 30% TO 75% MALEIC ANHYDRIDE, 15-60% ETHYLENE GLYCOL AND 5%-25% DEXTRAN, AND HEATING THE RESULTANT MIXTURE OF A TEMPERATURE OF BETWEEN 50* C. AND 300*C. TO FORM THE REACTION PRODUCT, AND ADDING NAPHTHALENE DIISOCYANATE TO THE RESULTANT DEXTRAN MODIFIED REACTION MASS, SAID DIISOCYANATE BEING ADDED IN AN AMOUNT OF 0.5 TO 1.5 MOLS OF THE SAME PER MOL OF SAID REACTION MASS, AND HEATING THE RESULTANT MIXTURE OF ABOUT 50*C. UNTIL A TOUGH RUBBERY PRODUCT IS PRODUCED.
Claim 2
Independent Claim
98 words
THE METHOD OF MAKING A RESINOUS COMPOSITION WHICH COMPRISES MIXING AND REACTING A MIXTURE OF CONSTITUENTS IN PARTS BY WEIGHT OF 30% TO 75% MALEIC ANHYDRIDE, 15-60% ETHYLENE GLYCOL AND 5%-25% DEXTRAN, AND HEATING THE RESULTANT MIXTURE OF A TEMPERATURE OF BETWEEN 50* C. AND 300*C. TO FORM THE REACTION PRODUCT, AND ADDING NAPHTHALENE DIISOCYANATE TO THE RESULTANT DEXTRAN MODIFIED REACTION MASS, SAID DIISOCYANATE BEING ADDED IN AN AMOUNT OF 0.5 TO 1.5 MOLS OF THE SAME PER MOL OF SAID REACTION MASS, AND HEATING THE RESULTANT MIXTURE OF ABOUT 50*C. UNTIL A TOUGH RUBBERY PRODUCT IS PRODUCED.
References Cited (Backward Citations)
US2933463A
Cited
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 |