US3157641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nu, nu'-ethylidene bis (nu-heterocyclic) compounds
Assignee: Dow Chemical Co
•
Filing: 1960-05-06
•
Granted: 1964-11-17
•
Expires: 1980-05-06
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm E Walles
- 👤 William W Bakke
- 👤 William F Tousignant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:03
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/08; C07D263/16; C07D263/18; C07D263/20; C07D263/22; C07D265/00; C07D265/28; C07D265/30; C07D265/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
19 words
METHOD FOR THE PREPARATION OF N,N''-ETHYLIDENE BIS (N-HETEROCYCLIC) COMPOUNDS SELECTED FROM THE GROUP OF THOSE HAVING THE STRUCTURAL FORMULAE:
Claim 2
Dependent Claim
19 words
METHOD FOR THE PREPARATION OF N,N''-ETHYLIDENE BIS (N-HETEROCYCLIC) COMPOUNDS SELECTED FROM THE GROUP OF THOSE HAVING THE STRUCTURAL FORMULAE:
Claim 3
Dependent Claim
18 words
THE METHOD OF CLAIM 1, WHEREIN SAID STARTING MATERIAL IS EPSILON-CAPROLACTAM AND SAID PRODUCT IS N,N''ETHYLIDENE BIS (2-CAPROLACTAM).
References Cited (Backward Citations)
DE1074045B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |