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Extract from the Register of European Patents

EP About this file: EP0436835

EP0436835 - Method for preparation of crystalline sodium silicates [Right-click to bookmark this link]
StatusPatent maintained as amended
Status updated on  08.09.2000
Database last updated on 20.12.2024
Most recent event   Tooltip05.10.2005Change: Appeal number 
Applicant(s)For all designated states
Clariant GmbH
65926 Frankfurt am Main / DE
[1998/33]
Former [1991/29]For all designated states
HOECHST AKTIENGESELLSCHAFT
D-65926 Frankfurt am Main / DE
Inventor(s)01 / Schimmel, Günther, Dr.
Ehrenstrasse 16
D-5042 Erfstadt / DE
02 / Kotzian, Michael, Dr.
Sanddornweg 2
D-5042 Erfstadt / DE
03 / Gradl, Reinhard, Dr.
Heimbacher Weg 27
D-5042 Erfstadt / DE
[1995/16]
Former [1991/29]01 / Schimmel, Günther, Dr.
Ehrenstrasse 16
W-5042 Erfstadt / DE
02 / Kotzian, Michael, Dr.
Sanddornweg 2
W-5042 Erfstadt / DE
03 / Gradl, Reinhard, Dr.
Heimbacher Weg 27
W-5042 Erfstadt / DE
Application number, filing date90123277.705.12.1990
[1991/29]
Priority number, dateDE1990400070512.01.1990         Original published format: DE 4000705
[1991/29]
Filing languageDE
Procedural languageDE
PublicationType: A2 Application without search report 
No.:EP0436835
Date:17.07.1991
Language:DE
[1991/29]
Type: A3 Search report 
No.:EP0436835
Date:22.04.1992
Language:DE
[1992/17]
Type: B1 Patent specification 
No.:EP0436835
Date:19.04.1995
Language:DE
[1995/16]
Type: B2 New European patent specification 
No.:EP0436835
Date:25.10.2000
Language:DE
[2000/43]
Search report(s)(Supplementary) European search report - dispatched on:EP02.03.1992
ClassificationIPC:C01B33/32
[1991/29]
CPC:
C01B33/38 (EP,US); C01B33/32 (KR)
Designated contracting statesAT,   BE,   CH,   DE,   DK,   ES,   FR,   GB,   GR,   IT,   LI,   LU,   NL,   SE [1991/29]
TitleGerman:Verfahren zur Herstellung von kristallinen Natriumsilikaten[1991/29]
English:Method for preparation of crystalline sodium silicates[1991/29]
French:Procédé de préparation de silicates de sodium cristallins[1991/29]
Examination procedure11.05.1992Examination requested  [1992/28]
22.03.1993Despatch of a communication from the examining division (Time limit: M04)
04.05.1993Reply to a communication from the examining division
01.03.1994Despatch of communication of intention to grant (Approval: No)
30.05.1994Despatch of communication of intention to grant (Approval: later approval)
07.06.1994Communication of intention to grant the patent
04.08.1994Fee for grant paid
04.08.1994Fee for publishing/printing paid
Opposition(s)Opponent(s)01  19.01.1996  26.02.1996  ADMISSIBLE
Industrial Silicates Limited
Titan Works, Hogg Lane, Grays
THURROCK, ESSEX RM17 5OU / GB
Opponent's representative
Sanderson, Laurence Andrew
SANDERSON & CO. European Patent Attorneys 34, East Stockwell Street Colchester
Essex CO1 1ST / GB
 [N/P]
Former [1998/19]
Opponent(s)01  19.01.1996  26.02.1996  ADMISSIBLE
Industrial Silicates Limited
Titan Works, Hogg Lane, Grays
THURROCK, ESSEX RM17 5DU / GB
Opponent's representative
Sanderson, Laurence Andrew
SANDERSON & CO. European Patent Attorneys 34, East Stockwell Street Colchester
Essex CO1 1ST / GB
Former [1998/10]
Opponent(s)01  19.01.1996  26.02.1996  ADMISSIBLE
Industrial Silicates Limited
Titan Works, Hogg Lane, Grays
THURROCK, ESSEX RM17 5DU / GB
Former [1996/11]
Opponent(s)01  19.01.1996  26.02.1996  ADMISSIBLE
Industrial Silicates Limited
Titan Works, Hogg Lane, Grays
THURROCK, ESSEX RM17 5DU / GB
Opponent's representative
Daniels, Jeffrey Nicholas
Page White & Farrer Bedford House John Street
London WC1N 2BF / GB
29.02.1996Invitation to proprietor to file observations on the notice of opposition
02.07.1996Reply of patent proprietor to notice(s) of opposition
01.07.1997Legal effect of interlocutory decision in opposition
01.07.1997Date of oral proceedings
10.10.1997Despatch of minutes of oral proceedings
19.12.1997Despatch of interlocutory decision in opposition
08.05.2000Despatch of communication that the patent will be maintained as amended
18.08.2000Fee for printing new specification paid
Appeal following opposition13.03.1998Appeal received No.  T0247/98
04.06.1998Statement of grounds filed
13.08.1998Invitation to file observations in an appeal (Time limit: M04) [1998/33]
10.02.1999Date of receipt of observations in an appeal [1999/07]
17.06.1999Result of appeal procedure: appeal of the opponent inadmissible
17.06.1999Date of oral proceedings
24.06.1999Minutes of the oral proceedings despatched
Fees paidRenewal fee
13.11.1992Renewal fee patent year 03
11.11.1993Renewal fee patent year 04
02.01.1995Renewal fee patent year 05
Opt-out from the exclusive  Tooltip
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Patent Court		 See the Register of the Unified Patent Court for opt-out data
Responsibility for the accuracy, completeness or quality of the data displayed under the link provided lies entirely with the Unified Patent Court.
Lapses during opposition  TooltipDK19.04.1995
GR19.04.1995
AT05.12.1999
LU05.12.1999
SE06.12.1999
CH31.12.1999
LI31.12.1999
NL01.07.2000
[2004/39]
Former [2002/02]DK19.04.1995
GR19.04.1995
AT05.12.1999
SE06.12.1999
CH31.12.1999
LI31.12.1999
NL01.07.2000
Former [2001/12]DK19.04.1995
GR19.04.1995
AT05.12.1999
SE06.12.1999
NL01.07.2000
Former [2001/09]DK19.04.1995
GR19.04.1995
AT05.12.1999
SE06.12.1999
Former [2001/08]DK19.04.1995
GR19.04.1995
AT05.12.1999
Former [2000/04]DK19.04.1995
GR19.04.1995
Former [1998/15]DK19.04.1995
Documents cited:Search[A]EP0056094  (MATOUSCHEK REINHARD DR);
 [A]EP0293640  (HOECHST AG [DE])
 [A]  - GLASTECHNISCHE BERICHTE, 37. Jahrgang, Heft 4, April 1964, Seiten 194-200, Frankfurt, DE; A. WILLGALLIS et al.: "Zur Polymorphie des Na2Si2O5"
The EPO accepts no responsibility for the accuracy of data originating from other authorities; in particular, it does not guarantee that it is complete, up to date or fit for specific purposes.