Patent US3223732A successfully refreshed from Google Patents.
US3223732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triacetyl- and tetraacetylmethylenediamine and process
Assignee: KONINK IND MAATSCHOPPIJ VORHEE
•
Filing: 1963-08-12
•
Granted: 1965-12-14
•
Expires: 1983-08-12
Abstract
No abstract record available.
Inventors
- 👤 Wilhelmus J C Viveen
- 👤 Cornelis U Kloosterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:31
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0039; C11D3/00; C11D3/39; C11D3/3902; C11D3/3905; C11D3/3907; C11D3/3917; C11D9/00; C11D9/04; C11D9/06; C11D9/08; C11D9/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 3
Dependent Claim
34 words
THE PROCESS FOR PREPARING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF N,N,N''N''-TETRAACETYLMETHYLENEDIAMINE AND MIXTURES THEREOF WITH N,N,N''-TRIACETYLMETHYLENEDIAMINE COMPRISING HEATING N,N''-DIACETYLMETHYLENEDIAMINE WITH ACETIC ACID ANHYDRIDE WHILE CONTINUOUSLY DISTILLING OFF ACETIC ACID FORMEDDURING THE REACTION.
Claim 4
Dependent Claim
34 words
THE PROCESS FOR PREPARING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF N,N,N''N''-TETRAACETYLMETHYLENEDIAMINE AND MIXTURES THEREOF WITH N,N,N''-TRIACETYLMETHYLENEDIAMINE COMPRISING HEATING N,N''-DIACETYLMETHYLENEDIAMINE WITH ACETIC ACID ANHYDRIDE WHILE CONTINUOUSLY DISTILLING OFF ACETIC ACID FORMEDDURING THE REACTION.
References Cited (Backward Citations)
US1534525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |