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EP0529498

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Extract from the Register of European Patents

EP About this file: EP0529498

EP0529498 - Process for the preparation of 2,5-di-(phenylamino)-terephthalic acid and its dialkylesters in high purity [Right-click to bookmark this link]
Status	No opposition filed within time limit Status updated on 27.09.1996 Database last updated on 28.03.2026
Most recent event Tooltip	27.09.1996	No opposition filed within time limit	published on 13.11.1996 [1996/46]
Applicant(s)	For all designated states HOECHST AKTIENGESELLSCHAFT 65926 Frankfurt am Main / DE
	[N/P]
Former [1993/09]	For all designated states HOECHST AKTIENGESELLSCHAFT D-65926 Frankfurt am Main / DE
Inventor(s)	01 / Ritter, Eberhard, Dr. Nordring 74 W-6082 Mörfelden-Walldorf / DE
	02 / Schäfer, Hans Am Reihsteig 15 W-6232 Bad Soden am Taunus / DE
	03 / Vollheim, Thomas, Dr. Langen-Bergheimer-Strasse 16 W-6450 Hanau 1 / DE
	04 / Schottler, Martin, Dr. Kapellenstrasse 33 W-6200 Wiesbaden / DE
	[1993/09]
Application number, filing date	92114144.6	19.08.1992
	[1993/09]
Priority number, date	DE19914127736	22.08.1991 Original published format: DE 4127736
	[1993/09]
Filing language	DE
Procedural language	DE
Publication	Type:	A2 Application without search report
	No.:	EP0529498
	Date:	03.03.1993
	Language:	DE
	[1993/09]
	Type:	A3 Search report
	No.:	EP0529498
	Date:	12.05.1993
	Language:	DE
	[1993/19]
	Type:	B1 Patent specification
	No.:	EP0529498
	Date:	22.11.1995
	Language:	DE
	[1995/47]
Search report(s)	(Supplementary) European search report - dispatched on:	EP	22.03.1993
Classification	IPC:	C07C227/16, C07C229/58, C07C229/62	[1993/19]
	CPC:	C07C227/16 (EP,US); C07C229/62 (KR)
	Former IPC [1993/09]	C07C227/16, C07C229/58, // C09B15/00
Designated contracting states	BE, CH, DE, ES, FR, GB, IT, LI, NL [1993/09]
Title	German:	Verfahren zur Herstellung von 2,5-Di-(phenylamino)-terephthalsäure und ihrer Dialkylester in hoher Reinheit	[1993/09]
	English:	Process for the preparation of 2,5-di-(phenylamino)-terephthalic acid and its dialkylesters in high purity	[1993/09]
	French:	Procédé pour la préparation de l'acide 2,5-di-(phénylamino)-téréphthalique et son esters en haute pureté	[1993/09]
Examination procedure	25.09.1993	Examination requested [1993/46]
	31.01.1995	Despatch of communication of intention to grant (Approval: Yes)
	13.03.1995	Communication of intention to grant the patent
	23.06.1995	Fee for grant paid
	23.06.1995	Fee for publishing/printing paid
Opposition(s)	23.08.1996	No opposition filed within time limit [1996/46]
Fees paid	Renewal fee
	07.07.1994	Renewal fee patent year 03
	31.08.1995	Renewal fee patent year 04
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