Patent US4098825A successfully refreshed from Google Patents.
US4098825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetylene-substituted aromatic benzils and acetylene-terminated quinoxaline compositions
Assignee: United States Department of the Air Force
•
Filing: 1977-01-24
•
Granted: 1978-07-04
•
Expires: 1997-01-24
Abstract
Abstract Acetylene-terminated quinoxaline compositions are prepared by reacting an aromatic bisbenzil with an excess of a bis(o-diamine) to provide an ortho-diamino endcapped quinoxaline oligomer which is then converted to the acetylene endcapped composition by reacting with an acetylenic benzil.
Inventors
- 👤 Fred E. Arnold
- 👤 Frederick L. Hedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:19
CPC Classifications
C; C07; C07C; C07C323/00; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07D; C07D241/00; C07D241/36; C07D241/38; C07D241/40; C07D241/42; C08; C08G; C08G73/00; C08G73/06; C08G73/0683; C08G73/0694
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
26 words
An acetylene-substituted aromatic benzil having the following formula: ##STR24## wherein R is oxygen or sulfur and R is ortho, meta or para to the carbonyl functionality.
Claim 2
Dependent Claim
26 words
An acetylene-substituted aromatic benzil having the following formula: ##STR24## wherein R is oxygen or sulfur and R is ortho, meta or para to the carbonyl functionality.
Claim 3
Dependent Claim
12 words
The acetylene-substituted aromatic benzil of claim 1 in which R is oxygen.
Claim 4
Dependent Claim
12 words
The acetylene-substituted aromatic benzil of claim 1 in which R is sulfur.
Claim 5
Dependent Claim
9 words
An acetylene-substituted aromatic benzil having the following formula: ##STR25##
Claim 6
Dependent Claim
9 words
An acetylene-substituted aromatic benzil having the following formula: ##STR25##
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |