Patent US2864872A successfully refreshed from Google Patents.
US2864872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cracking of 1, 1-diarylethanes to substituted styrenes
Assignee: Wyeth Holdings LLC
•
Filing: 1956-05-01
•
Granted: 1958-12-16
•
Expires: 1976-05-01
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Saunders
- 👤 Edwin M Smolin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:08
CPC Classifications
C; C07; C07C; C07C4/00; B; B01; B01J; B01J21/00; B01J21/12; B01J37/00; B01J37/0009; C07C17/00; C07C17/361; C07C2521/00; C07C2521/12; C07C2531/00; C07C2531/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN A METHOD OF PRODUCTING MOMONUCLEAR VINYL AROMATIC COMPOUNDS, THE STEP WHICH COMPRISES CATALYTICALLY DECOMPOSING A 1,1-DIARYLETHANE IN THE PRESEWNCE OF KAOLIN. CONTAINING AS A BINDER THEREOF, A HYDROLYZED ALKYL ORTHO SILICATE SAID KAOLIN AND SAID BINDER BEEN SUBJECTED TO ABKING AT A TEMPERATURES OF FROM ABOUT 350*C. TO 550*C.
Claim 2
Dependent Claim
50 words
IN A METHOD OF PRODUCTING MOMONUCLEAR VINYL AROMATIC COMPOUNDS, THE STEP WHICH COMPRISES CATALYTICALLY DECOMPOSING A 1,1-DIARYLETHANE IN THE PRESEWNCE OF KAOLIN. CONTAINING AS A BINDER THEREOF, A HYDROLYZED ALKYL ORTHO SILICATE SAID KAOLIN AND SAID BINDER BEEN SUBJECTED TO ABKING AT A TEMPERATURES OF FROM ABOUT 350*C. TO 550*C.
References Cited (Backward Citations)
US2519719A
Cited
US2695893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |