Patent US2810711A successfully refreshed from Google Patents.
US2810711A
Expired / Lapsed
US
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Polymeric isocyanates and their production
Assignee: Bayer AG
•
Filing: 1954-05-19
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Granted: 1957-10-22
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Expires: 1974-05-19
Abstract
No abstract record available.
Inventors
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:57
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; Y; Y10; Y10S; Y10S528/00; Y10S528/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A PROCESS FOR THE PRODUCTION OF POLYMERIC ISOCYANATES, WHICH COMPRISES CONTACTING A HALOGENOALKY ARYL ISOCYANATE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
19 words
A PROCESS FOR THE PRODUCTION OF POLYMERIC ISOCYANATES, WHICH COMPRISES CONTACTING A HALOGENOALKY ARYL ISOCYANATE OF THE GENERAL FORMULA
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) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |