US3676455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydantoin diisocyanates
Assignee: Novartis Corp
•
Filing: 1970-04-08
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Granted: 1972-07-11
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Expires: 1990-04-08
Abstract
Abstract New bis-(1''- gamma -isocyanatopropylhydantoinyl-3'')-alkanes, for example 1,6-bis-(1''-(- gamma -isocyanatopropyl)-5'',5''dimethylhydantoinyl-3'')-n-hexane and 1,1''-methylene-bis-(3- gamma -isocyanatopropylhydantoins), for example 1,1''-methylene-bis-(3gamma -isocyanatopropyl-5,5-dimethylhydantoin), and their use for the manufacture of polyurethanes by reaction of the new diisocyanates with polyhydroxyl compounds. The new diisocyanates are completely odorless and an irritation of the mucous membranes by these new diisocyanates has hitherto not been observed. The new diisocyanates are therefore preferentially used in the lacquer field.
Inventors
- 👤 Theobald Haug
- 👤 Hans Batzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:43
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7875; C08G18/7887; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
4 words
A diisocyanate of formula
Claim 2
Dependent Claim
3 words
1,1''-Methylene-bis-(3- gamma -isocyanatopropyl-5,5-dimethylhydantoin).
Claim 3
Dependent Claim
3 words
1,1''-Methylene-bis-(3- gamma -isocyanatopropyl-5-isopropylhydantoin).
Claim 4
Dependent Claim
3 words
1,6-Bis-(1''- gamma -isocyanatopropyl-5'',5''-dimethylhydantoinyl-3'')-n-hexane.
Claim 5
Dependent Claim
6 words
Beta , Beta ''-Bis-(1''- gamma -isocyanatopropyl-5'',5''-dimethylhydantoinyl-3'')-diethyl-ether.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |