US3225094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyamines by steam hydrolysis of polyisocyanate reaction products
Assignee: EIDP Inc
•
Filing: 1962-06-15
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Granted: 1965-12-21
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Expires: 1982-06-15
Abstract
No abstract record available.
Inventors
- 👤 Wolf Herbert Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:30
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/14; C08J2375/00; C08J2375/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A PROCESS FOR OBTAINING A POLYAMINE WHICH COMPRISES HYDROLYZING IN THE ABSENCE OF CONDENSED WATER A PHOSGENATION TAR WITH STEAM SUPERHEATED TO A TEMPERATURE BETWEEN 200-400*C.
Claim 2
Dependent Claim
26 words
A PROCESS FOR OBTAINING A POLYAMINE WHICH COMPRISES HYDROLYZING IN THE ABSENCE OF CONDENSED WATER A PHOSGENATION TAR WITH STEAM SUPERHEATED TO A TEMPERATURE BETWEEN 200-400*C.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |