Number | Date | Country | Kind |
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195 49 032 | Dec 1995 | DEX |
This application is a Divisional of application Ser. No. 08/777,702, filed on Dec. 20, 1996, now U.S. Pat. No. 5,763,666.
Number | Name | Date | Kind |
---|---|---|---|
2744938 | Urban, Jr. | May 1956 | |
2833824 | Pecherer | May 1958 | |
4946977 | Bernhardt et al. | Aug 1990 | |
5763666 | Frings et al. | Jun 1998 |
Number | Date | Country |
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38 32 621 | Sep 1989 | DEX |
Entry |
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Chemical Abstracts, vol. 89, No. 3, Jul. 17, 1978, AN-23925, S. I. Burmistrov, et al., "Purification of N,N'-Dephenyl-P-Phenylenediamine", and SU 595 295, Mar. 20, 1978. |
Beilstein 13, IV, p. 116. |
Chemical Abstracts, vol. 67, Abstract No. 3353m, Jul. 3, 1967. |
The Merck Index, p. 389, 1968. |
Number | Date | Country | |
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Parent | 777702 | Dec 1996 |