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1.发明授权Process for the production of a pore tight coating on silicon nitride molded bodies 失效在氮化硅模体上生产一种密封涂层的方法
公开(公告)号：US3535154A
公开(公告)日：1970-10-20
申请号：US3535154D
申请日：1968-12-19
Applicant: DEGUSSA
Inventor： MEYER-SIMON EUGEN , KUHNER GERHARD , MEFFERT PAUL
CPC classification number: C04B41/009 , C04B41/5025 , C04B41/87 , C04B41/455 , C04B41/5007 , C04B35/584
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公开(公告)号：DE1950671A1
公开(公告)日：1971-04-22
申请号：DE1950671
申请日：1969-10-08
Applicant: DEGUSSA
Abstract: Alkali thiocyanates are prepared by reacting alkali cyanides with sulfur in the presence of alkali sulfide in a molar amount of 1:1000 to 1:2000 as a solubilizer for the sulfur. The reaction is carried out above the melting point of sulfur, preferably in an alkali thiocyanate solution. The alkali sulfide is then converted to the sulfate by oxidation with hydrogen peroxide.
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公开(公告)号：DE2234543A1
公开(公告)日：1974-01-31
申请号：DE2234543
申请日：1972-07-14
Applicant: DEGUSSA
Inventor： BEYER HANS-HERMANN DR , ROEBKE WOLFGNAG DR , WAGNER ADOLF , MEFFERT PAUL
IPC: H01C17/065 , H01C7/00
Abstract: The pastes are suitable for thick film technology and give a surface resistance advantageous for technical applications, even when fired without a protective gas atmos. The sulphides can be pptd. in very finely-divided form, obviating the need for grinding. A wide range of resistance values is possible (101 - 106 ohm/sq.) if noble metal(alloy) powder is incorporated and this also improves the temp. coefft., noise ration and long-term stability. Sulphides of Pd and Ru are pref.
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Patent Agency Ranking
公开(公告)号：DE1771273A1
公开(公告)日：1972-01-05
申请号：DE1771273
申请日：1968-04-27
Applicant: DEGUSSA
Inventor： MEYER-SIMON EUGEN DIPL-CHEM DR , KUEHNER GERHARD DIPL-CHEM DR , BRUNKEN RENKE DIPL-PHYS DR , MEFFERT PAUL
IPC: C04B35/486 , C04B35/48
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公开(公告)号：YU246370A
公开(公告)日：1977-08-31
申请号：YU246370
申请日：1970-10-07
Applicant: DEGUSSA
Inventor： PFLEGER HANS , HANS PFLEGER , BITTNER FRIEDRICH , FRIEDRICH BITTNER , MEFFERT PAUL , PAUL MEFFERT
IPC: C01C3/20 , C07C161/02
Abstract: Alkali thiocyanates are prepared by reacting alkali cyanides with sulfur in the presence of alkali sulfide in a molar amount of 1:1000 to 1:2000 as a solubilizer for the sulfur. The reaction is carried out above the melting point of sulfur, preferably in an alkali thiocyanate solution. The alkali sulfide is then converted to the sulfate by oxidation with hydrogen peroxide.
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公开(公告)号：GB1272900A
公开(公告)日：1972-05-03
申请号：GB4739570
申请日：1970-10-06
Applicant: DEGUSSA
Inventor： PFLEGER HANS , BITTNER FRIEDRICH , MEFFERT PAUL
IPC: C01C3/20
Abstract: 1,272,900. Alkali metal thiocyanates. DEUTSCHE GOLD UND SILBER SCHEIDEANSTALT. 6 Oct., 1970 [8 Oct., 1969], No. 47395/70. Heading C1A. An alkali metal thiocyanate is produced by reacting alkali metal cyanide and sulphur at a temperature above the m.pt. of sulphur (112À8‹ C.) in the presence of alkali metal sulphide used in a molar sulphide; sulphur ratio of from 1 : 1000 to 1 : 2000. The reaction is preferably carried out in a solution of the thiocyanate and in the presence of a wetting agent. On completion of the reaction, the sulphide may be oxidized to sulphate with H 2 O 2 and precipitated at BaSO 4 with BaCO 3 and filtered off. The solution may be concentrated to crystallize out, e.g. NaSCN.2H 2 O. The alkali metal may be Na or K.
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公开(公告)号：YU33707B
公开(公告)日：1978-02-28
申请号：YU246370
申请日：1970-10-07
Applicant: DEGUSSA
Inventor： HANS PFLEGER , PFLEGER HANS , FRIEDRICH BITTNER , BITTNER FRIEDRICH , PAUL MEFFERT , MEFFERT PAUL
IPC: C01C3/20 , C07C161/02
Abstract: Alkali thiocyanates are prepared by reacting alkali cyanides with sulfur in the presence of alkali sulfide in a molar amount of 1:1000 to 1:2000 as a solubilizer for the sulfur. The reaction is carried out above the melting point of sulfur, preferably in an alkali thiocyanate solution. The alkali sulfide is then converted to the sulfate by oxidation with hydrogen peroxide.
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公开(公告)号：DE1646500A1
公开(公告)日：1971-07-15
申请号：DE1646500
申请日：1967-12-20
Applicant: DEGUSSA
IPC: C04B35/584 , C04B
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