Patent US4239700A successfully refreshed from Google Patents.
US4239700A
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Isatoic anhydride derivatives and use as chain-extenders
Assignee: Huntsman Corp
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Filing: 1979-05-22
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Granted: 1980-12-16
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Expires: 1999-05-22
Abstract
Abstract Covers certain aromatic-amine amides which comprise the reaction product of a bis-amino-n propyl ether and an isatoic anhydride of the formula: ##STR1## where R is selected from the group consisting of hydrogen, alkyl, nitro, halo, hydroxy, amino, and cyano, and n is a number of 1-4. Also covers the use of said compounds as chain-extenders in polyurethane compositions. Such chain-extenders provide for the production of polyurethane elastomers having improved tensile strength, tear strength and elongation properties.
Inventors
- 👤 Edward T. Marquis
- 👤 Ernest L. Yeakey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:50
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3825
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
45 words
A compound of the formula: ##STR11## where R is selected from the group consisting of hydrogen, alkyl, nitro, halo, hydroxy, amino and cyano, n is a number of 1-4, x is a number of from 2 to 6 and R 1 is hydrogen or ##STR12##
Claim 2
Dependent Claim
45 words
A compound of the formula: ##STR11## where R is selected from the group consisting of hydrogen, alkyl, nitro, halo, hydroxy, amino and cyano, n is a number of 1-4, x is a number of from 2 to 6 and R 1 is hydrogen or ##STR12##
Claim 3
Dependent Claim
8 words
The compound of claim 1 which is ##STR13##
Claim 4
Dependent Claim
8 words
The compound of claim 1 which is ##STR14##
Claim 5
Dependent Claim
9 words
The compound of claim 2 where x is 4.
Claim 6
Dependent Claim
9 words
The compound of claim 3 where x is 2.
References Cited (Backward Citations)
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US4049716A
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |