US2653979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of diarylethanes
Assignee: Wyeth Holdings LLC
•
Filing: 1948-11-05
•
Granted: 1953-09-29
•
Expires: 1968-11-05
Abstract
No abstract record available.
Inventors
- 👤 Edward L Kropa
- 👤 Arthur S Nyquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:22
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/054; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1213; C07C2531/00; C07C2531/02; C07C2531/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS WHICH COMPRISES REACTING SUBSTANCES CONSISTING OF AN ARYL COMPOUND CONTAINING AT LEAST ONE HYDROGEN ATOM ATTACHED TO AN AROMATIC NUCLEUS WITH VINYL ACETATE IN MOLAR PROPORTIONS OF AT LEAST 5:1 AND IN THE PRESENCE OF AN ALKYLATION CATALYST, WHEREBY A 1,1-DIARYLETHANE IS PRODUCED.
Claim 2
Dependent Claim
45 words
A PROCESS WHICH COMPRISES REACTING SUBSTANCES CONSISTING OF AN ARYL COMPOUND CONTAINING AT LEAST ONE HYDROGEN ATOM ATTACHED TO AN AROMATIC NUCLEUS WITH VINYL ACETATE IN MOLAR PROPORTIONS OF AT LEAST 5:1 AND IN THE PRESENCE OF AN ALKYLATION CATALYST, WHEREBY A 1,1-DIARYLETHANE IS PRODUCED.
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) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |