US2868844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective nitration process
Assignee: Ethyl Corp
•
Filing: 1957-01-22
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Granted: 1959-01-13
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Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Coffield
- 👤 Margaret E Griffing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:20
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/08; Y; Y10; Y10S; Y10S524/00; Y10S524/925; Y10S524/929
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
THE PROCESS OF PREPARING 4-NITRO-2,6-DIALKYL PHENOLS IN WHICH EACH ALKYL GROUP IS BRANCHED ON ITS ALPHA CARBON ATOM, WHICH COMPRISES NITRATING THE CORRESPONDING 2,6-DIALKYL PHENOL WITH 30 TO 70 PERCENT NITRIC ACID AT A TEMPERATURE RANGING FROM ABOUT 0 TO ABOUT 40* C., THE REACTION BEING CARRIED OUT IN AN INERT LIQUID HYDROCARBON SOLVENT.
Claim 2
Dependent Claim
54 words
THE PROCESS OF PREPARING 4-NITRO-2,6-DIALKYL PHENOLS IN WHICH EACH ALKYL GROUP IS BRANCHED ON ITS ALPHA CARBON ATOM, WHICH COMPRISES NITRATING THE CORRESPONDING 2,6-DIALKYL PHENOL WITH 30 TO 70 PERCENT NITRIC ACID AT A TEMPERATURE RANGING FROM ABOUT 0 TO ABOUT 40* C., THE REACTION BEING CARRIED OUT IN AN INERT LIQUID HYDROCARBON SOLVENT.
References Cited (Backward Citations)
US2459597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |