Patent US3880809A successfully refreshed from Google Patents.
US3880809A
Expired / Lapsed
US
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Container resistant to hydrocarbon materials
Assignee: Engineered Fabrics Corp
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Filing: 1974-01-14
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Granted: 1975-04-29
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Expires: 1994-01-14
Abstract
Abstract A container having resistance to hydrocarbon materials formed of a polyurethane having an elongation in excess of 200 percent at 65*F., the polyurethane being the reaction product of an organic polyisocyanate and a mixture of polytetramethylene azelate and polytetramethylene adipate and a diamine.
Inventors
- 👤 Anthony F Finelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:34
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4202; C08G18/08; C08G18/10; C08G18/12; C08G2390/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A CONTAINER HAVING RESISTANCE TO HYDROCARBON MATERIALS, AS MEASURED BY ASTM METHOD D-471-59T OF LESS THAN 25 PERCENT VOLUME CHANGE FORMED OF A POLYURETHANE HAVING AN ELONGATION IN EXCESS OF 200 PERCENT AT -65*F., SAID POLYURETHANE BEING THE REACTION PRODUCT OF A 1. 1.25 TO 2.5 MOLS OF AN ORGANIC POLYISOCYANATE CONTAINING ESSENTIALLY TOLUENE DIISOCYANATE WITH 2. 1 MOL OF A HYDROXYL TERMINATED POLYESTER WHICH COMPRISES AT LEAST 20 WEIGHT PERCENT OF A TETRAMETHYLENE AZELATE HAVING A MOLECULAR WEIGHT OF ABOUT 800 TO 3000 AND ABOUT 80 TO 0 WEIGHT PERCENT OF A TETRAMETHYLENE PATE HAVING A MOLECULAR WEIGHT OF ABOUT 800 TO ABOUT 3000, AND 3. 0.5 TO ABOUT 0.9 MOLS OF A DIAMINE FOR EACH MOL OF POLYISOCYANATE IN EXCESS OF THAT EQUIVALENT TO THE HYDROXYL TERMINATED POLYESTER.
Claim 2
Dependent Claim
130 words
A CONTAINER HAVING RESISTANCE TO HYDROCARBON MATERIALS, AS MEASURED BY ASTM METHOD D-471-59T OF LESS THAN 25 PERCENT VOLUME CHANGE FORMED OF A POLYURETHANE HAVING AN ELONGATION IN EXCESS OF 200 PERCENT AT -65*F., SAID POLYURETHANE BEING THE REACTION PRODUCT OF A 1. 1.25 TO 2.5 MOLS OF AN ORGANIC POLYISOCYANATE CONTAINING ESSENTIALLY TOLUENE DIISOCYANATE WITH 2. 1 MOL OF A HYDROXYL TERMINATED POLYESTER WHICH COMPRISES AT LEAST 20 WEIGHT PERCENT OF A TETRAMETHYLENE AZELATE HAVING A MOLECULAR WEIGHT OF ABOUT 800 TO 3000 AND ABOUT 80 TO 0 WEIGHT PERCENT OF A TETRAMETHYLENE PATE HAVING A MOLECULAR WEIGHT OF ABOUT 800 TO ABOUT 3000, AND 3. 0.5 TO ABOUT 0.9 MOLS OF A DIAMINE FOR EACH MOL OF POLYISOCYANATE IN EXCESS OF THAT EQUIVALENT TO THE HYDROXYL TERMINATED POLYESTER.
Claim 3
Dependent Claim
48 words
1 mol of a hydroxyl terminated polyester which comprises at least 20 weight percent of a tetramethylene azelate having a molecular weight of about 800 to 3000 and about 80 to 0 weight percent of tetramethylene adipate having a molecular weight of about 800 to about 3000, and
Claim 4
Dependent Claim
48 words
1 mol of a hydroxyl terminated polyester which comprises at least 20 weight percent of a tetramethylene azelate having a molecular weight of about 800 to 3000 and about 80 to 0 weight percent of tetramethylene adipate having a molecular weight of about 800 to about 3000, and
Claim 5
Dependent Claim
23 words
0.5 to about 0.9 mols of a diamine for each mol of polyisocyanate in excess of that equivalent to the hydroxyl terminated polyester.
Claim 6
Dependent Claim
23 words
0.5 to about 0.9 mols of a diamine for each mol of polyisocyanate in excess of that equivalent to the hydroxyl terminated polyester.
References Cited (Backward Citations)
US3004939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |