US2615919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color stabilized n,n'-di-(sec.-butyl)-p-phenylenediamine
Assignee: EIDP Inc
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Filing: 1949-03-09
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Granted: 1952-10-28
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Expires: 1969-03-09
Abstract
No abstract record available.
Inventors
- 👤 Charles B Biswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/82; C07C209/90; C07C211/00; C07C211/43; C07C211/44; C07C211/49; C07C211/50; C07C211/51
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A COMPOSITION CONSISTING ESSENTIALLY OF N,N''DI-(SEC-BUTYL)-P-PHENYLENEDIAMINE, WHICH HAS BEEN MADE BY A REDUCTIVE ALKYLATION PROCESS FOLLOWED BY VACUUM DISTILLATION AND WHICH CONTAINS A SMALL PROPORTION OF DIFFICULTLY SEPARABLE IMPURITIES FORMED IN SUCH PROCESS THAT NORMALLY TEND TO CAUSE DISCOLORATION UPON EXPOSURE TO AIR AND LIGHT, AND FROM ABOUT 0.2% TO ABOUT 5% OF A SATURATED HETEROCYCLIC IMINE OF TH E CLASS CONSISTING OF PYRROLIDINE, PIPERIDINE, DIPIPERIDYL, MORPHOLINE, THIAMORPHOLINE, PIPERAZINE, 1,3,5-DITHIAZINE, AND SUCH IMINES CONTAINING METHYL RADICAL SUBSTITUENTS ON THE IMINE RING, AND WHICH IMINE, EXCEPT FOR THE NITROGEN, OXYGEN AND SULFUR ATOMS THAT ARE MEMBERS OF THE HETEROCYCLIC RING, CONSISTS OF CARBON AND HYDROGEN ATOMS.
Claim 2
Dependent Claim
105 words
A COMPOSITION CONSISTING ESSENTIALLY OF N,N''DI-(SEC-BUTYL)-P-PHENYLENEDIAMINE, WHICH HAS BEEN MADE BY A REDUCTIVE ALKYLATION PROCESS FOLLOWED BY VACUUM DISTILLATION AND WHICH CONTAINS A SMALL PROPORTION OF DIFFICULTLY SEPARABLE IMPURITIES FORMED IN SUCH PROCESS THAT NORMALLY TEND TO CAUSE DISCOLORATION UPON EXPOSURE TO AIR AND LIGHT, AND FROM ABOUT 0.2% TO ABOUT 5% OF A SATURATED HETEROCYCLIC IMINE OF TH E CLASS CONSISTING OF PYRROLIDINE, PIPERIDINE, DIPIPERIDYL, MORPHOLINE, THIAMORPHOLINE, PIPERAZINE, 1,3,5-DITHIAZINE, AND SUCH IMINES CONTAINING METHYL RADICAL SUBSTITUENTS ON THE IMINE RING, AND WHICH IMINE, EXCEPT FOR THE NITROGEN, OXYGEN AND SULFUR ATOMS THAT ARE MEMBERS OF THE HETEROCYCLIC RING, CONSISTS OF CARBON AND HYDROGEN ATOMS.
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) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |