Patent US2723265A successfully refreshed from Google Patents.
US2723265A
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Doubly hindered diisocyanates
Assignee: EIDP Inc
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Filing: 1952-07-21
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Granted: 1955-11-08
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Expires: 1972-07-21
Abstract
No abstract record available.
Inventors
- 👤 Stallmann Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:17
CPC Classifications
C; C07; C07C; C07C265/00; C07C275/00; C07C275/28; C07C275/40; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/73; C08G18/74; C08G18/76; C08G18/7614; C08G18/7628; C08G18/77; C08G18/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A DIISOCYANATE HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
6 words
A DIISOCYANATE HAVING THE FOLLOWING FORMULA:
References Cited (Backward Citations)
US2437867A
Cited
US2620349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |