US3684773A
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Synthesis of cyanoformamidyl isocyanates and polyiminoimidazolidinediones therefrom
Assignee: TAD L PATTON
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Filing: 1970-09-29
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Granted: 1972-08-15
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Expires: 1990-09-29
Abstract
Abstract The monoadduct of a diisocyanate and hydrogen cyanide, a cyanoformamidyl isocyanate, is produced by the reaction of one mole of a diisocyanate with one mole of hydrogen cyanide. Heterocyclic polymers are produced by the head-to-tail polymerization of cyanoformamidyl isocyanates in an appropriate solvent and in the presence of an effective catalyst.
Inventors
- 👤 Tad L Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:51
CPC Classifications
C; C07; C07C; C07C255/00; C07C265/00; C08; C08G; C08G18/00; C08G18/02; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3838; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
10 words
A polymer according to claim 1 wherein X is NH.
Claim 2
Dependent Claim
15 words
A polymer according to claim 1 wherein R1 and R2 are both aliphatic organic moieties.
Claim 3
Dependent Claim
15 words
A polymer according to claim 1 wherein R1 and R2 are both aromatic organic moieties.
Claim 4
Dependent Claim
13 words
A polymer according to claim 3 wherein R1 and R2 are both hexamethylene.
Claim 5
Dependent Claim
13 words
A polymer according to claim 4 wherein R1 and R2 are both methylphenylene.
Claim 6
Dependent Claim
14 words
A process for producing a heterocyclic polymer characterized by having the following repeating unit:
Claim 7
Dependent Claim
21 words
A process according to claim 7 wherein said solvent is selected from the group consisting of dipolar aprotic and aromatic compounds.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |