Patent US4400540A successfully refreshed from Google Patents.
US4400540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxy and thioaryl-phenylated aromatic biscyclopentadienones
Assignee: United States Department of the Air Force
•
Filing: 1982-04-08
•
Granted: 1983-08-23
•
Expires: 2002-04-08
Abstract
Abstract Oxy- and thio-aryl-phenylated aromatic biscyclopentadienones are prepared from aromatic bis-benzils and benzylketones.
Inventors
- 👤 Bruce A. Reinhardt
- 👤 Fred E. Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:58
CPC Classifications
C; C07; C07C; C07C255/00; C07C323/00; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C45/74; C07C49/00; C07C49/587; C07C49/703; C07C49/747; C07C49/753; C07C49/76; C07C49/82; C07C49/835; C07C49/84; C08; C08G; C08G61/00; C08G61/02; C08G61/10; C08G61/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
An aromatic biscyclopentadienone having the general formula ##STR5## wherein Ar is a monovalent aromatic radical selected from the group consisting of ##STR6## Ar' is a divalent aromatic radical selected from the group consisting of ##STR7## and R is a monovalent aromatic radical selected from the group consisting of ##STR8##
Claim 2
Dependent Claim
49 words
An aromatic biscyclopentadienone having the general formula ##STR5## wherein Ar is a monovalent aromatic radical selected from the group consisting of ##STR6## Ar' is a divalent aromatic radical selected from the group consisting of ##STR7## and R is a monovalent aromatic radical selected from the group consisting of ##STR8##
Claim 3
Dependent Claim
16 words
The compound of claim 1 wherein R is phenyl, Ar is p-phenoxyphenyl and Ar' is 1,3-phenylene.
Claim 4
Dependent Claim
16 words
The compound of claim 1 wherein R is phenyl, Ar is p-thiophenoxyphenyl and Ar' is 1,3-phenylene.
References Cited (Backward Citations)
US4108835A
Cited
US4131748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |