Patent US3330828A successfully refreshed from Google Patents.
US3330828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of polyisocyanates
Assignee: Bayer AG
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Filing: 1965-04-13
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Granted: 1967-07-11
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Expires: 1985-04-13
Abstract
No abstract record available.
Inventors
- 👤 Grogler Gerhard
- 👤 Windemuth Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PROCESS FOR THE PREPARATION OF POLYISOCYANATES HAVING AN ISOCYANURATE STRUCTURE WHICH COMPRISES POLYMERIZING ORGANIC ISOCYANATES IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF N-ALKYLI METAL AMINES, N-ALKALI METAL CARBOXYLIC ACID AMIDES, N-ALKALI EACH METAL AMINES, AND N-ALKALINE EARTH METAL CARBOXYLIC ACID AMIDES.
Claim 2
Dependent Claim
47 words
A PROCESS FOR THE PREPARATION OF POLYISOCYANATES HAVING AN ISOCYANURATE STRUCTURE WHICH COMPRISES POLYMERIZING ORGANIC ISOCYANATES IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF N-ALKYLI METAL AMINES, N-ALKALI METAL CARBOXYLIC ACID AMIDES, N-ALKALI EACH METAL AMINES, AND N-ALKALINE EARTH METAL CARBOXYLIC ACID AMIDES.
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) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |