US3373210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of alkylphenols
Assignee: Fujifilm Holdings Corp
•
Filing: 1965-10-22
•
Granted: 1968-03-12
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Nishio Fumihiko
- 👤 Oi Reichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:36
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR THE PRODUCTION OF AN ALKYLPHENOL WHICH COMPRISES REACTING A PHENOL WITH DIISOBUTYLENE IN THE PRESENCE OF METHANOL USING SULFURIC ACID AS A CATALYST, THE VOLUME OF THE METHANOL BEING FROM 1/2 TO 2 TIMES THE VOLUME OF SULFURIC ACID IN THE SYSTEM.
Claim 2
Dependent Claim
45 words
A PROCESS FOR THE PRODUCTION OF AN ALKYLPHENOL WHICH COMPRISES REACTING A PHENOL WITH DIISOBUTYLENE IN THE PRESENCE OF METHANOL USING SULFURIC ACID AS A CATALYST, THE VOLUME OF THE METHANOL BEING FROM 1/2 TO 2 TIMES THE VOLUME OF SULFURIC ACID IN THE SYSTEM.
References Cited (Backward Citations)
US2332555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |