Patent US1352097A successfully refreshed from Google Patents.
Patent US2943112A successfully refreshed from Google Patents.
US2943112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of diphenylamine
Assignee: Pennwalt Corp
•
Filing: 1957-11-06
•
Granted: 1960-06-28
•
Expires: 1977-11-06
Abstract
No abstract record available.
Inventors
- 👤 Ivan C Popoff
- 👤 Paul G Haines
- 👤 Charles E Inman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:22
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A METHOD OF ALKYLATING DIPHENYLAMINE COMPRISING THE STEPS OF REACTING DIPHENYLAMINE WITH RELATIVELY UNREACTIVE OLEFINS CONSISTING PREDOMINANTLY OF THOSE FROM THE CLASS CONSISTING OF SECONDARY ALKENES AND INTERNALLY DOUBLE BONDED TERTIARY ALKENES HAVING FROM 5 TO 12 CARBON ATOMS IN THE PRESENCE OF AN ACIDIC CATALYST AT A TEMPERATURE OF FROM 120*C. TO 250*C. AND A PRESSURE FROM ATMOSPHERIC TO 500 POUNDS PER SQUARE INCH AND MOLAR RATIOS OF OLEFIN:DIPHENYLAMINE OF FROM 1:1 TO 10:1 TO PRODUCE A REACTION MIXTURE CONTAINING FROM 75% TO 94% OF ALKYLATED DIPHENYLAMINE OF FROM ABOUT 6% TO 25% OF UNALKYLATED DIPHENYLAMINE, ADDING TO SAID REACTION MIXTURE A SECOND OLEFIN SELECTED FROM THE CLASS CONSISTING OD STYRENE, VINYL NAPHTHALENE AND THE X-METHYL DERIVATIVES THEREOF, 2-METHYL BUTENE-2, TERTIARY MONO-ALKENES HAVING A TERMINAL DOUBLE BOND AND FROM 4 TO 10 CARBON ATOMS, AND CONJUGATED ALKADIENES HAVING FROM 4 TO 10 CARBON ATOMS, AND REACTING SAID MIXTURE IN THE PRESENCE OF AN ACIDIC CATALYST AND UNDER SAID REACTION CONDITIONS TO PROVIDE A FINAL PRODUCT CONTAINING LESS THAN 3% OF UNALKYLATED DIPHENYLAMINE.
Claim 2
Independent Claim
173 words
A METHOD OF ALKYLATING DIPHENYLAMINE COMPRISING THE STEPS OF REACTING DIPHENYLAMINE WITH RELATIVELY UNREACTIVE OLEFINS CONSISTING PREDOMINANTLY OF THOSE FROM THE CLASS CONSISTING OF SECONDARY ALKENES AND INTERNALLY DOUBLE BONDED TERTIARY ALKENES HAVING FROM 5 TO 12 CARBON ATOMS IN THE PRESENCE OF AN ACIDIC CATALYST AT A TEMPERATURE OF FROM 120*C. TO 250*C. AND A PRESSURE FROM ATMOSPHERIC TO 500 POUNDS PER SQUARE INCH AND MOLAR RATIOS OF OLEFIN:DIPHENYLAMINE OF FROM 1:1 TO 10:1 TO PRODUCE A REACTION MIXTURE CONTAINING FROM 75% TO 94% OF ALKYLATED DIPHENYLAMINE OF FROM ABOUT 6% TO 25% OF UNALKYLATED DIPHENYLAMINE, ADDING TO SAID REACTION MIXTURE A SECOND OLEFIN SELECTED FROM THE CLASS CONSISTING OD STYRENE, VINYL NAPHTHALENE AND THE X-METHYL DERIVATIVES THEREOF, 2-METHYL BUTENE-2, TERTIARY MONO-ALKENES HAVING A TERMINAL DOUBLE BOND AND FROM 4 TO 10 CARBON ATOMS, AND CONJUGATED ALKADIENES HAVING FROM 4 TO 10 CARBON ATOMS, AND REACTING SAID MIXTURE IN THE PRESENCE OF AN ACIDIC CATALYST AND UNDER SAID REACTION CONDITIONS TO PROVIDE A FINAL PRODUCT CONTAINING LESS THAN 3% OF UNALKYLATED DIPHENYLAMINE.
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) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |