US3072652A
Expired / Lapsed
US
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Preparation of ethylidene bis-(n-heterocyclic) compounds
Assignee: Dow Chemical Co
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Filing: 1959-10-21
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Granted: 1963-01-08
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Expires: 1979-10-21
Abstract
No abstract record available.
Inventors
- 👤 Richard A Hickner
- 👤 William W Bakke
- 👤 Claude I Judd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:41
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267; C07D263/00; C07D263/02; C07D263/08; C07D263/16; C07D263/18; C07D263/20; C07D263/22; C07D265/00; C07D265/04; C07D265/06; C07D265/08; C07D265/10; C07D265/28; C07D265/30; C07D265/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 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
18 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
17 words
THE METHOD OF CLAIM 1, WHEREIN SAID STARTING MATERIAL IS 2-OXAZINIDINONE AND SAID PRODUCT IS N,N''-ETHYLIDENE BIX(2-OXAZINIDINONE).
References Cited (Backward Citations)
US2891058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |