HOFFMANN & CO. ELEKTROKOHLE AKTIENGESELLSCHAFT

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
B22D CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES 247
 
  
 
B60L ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL 274
 
  
 
H02K DYNAMO-ELECTRIC MACHINES 2105
 
  
 
B21D WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING 155
 
  
 
B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM1156
 
  
 
C03C CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS159
 
  
 
C04B LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS 167
 
  
 
C25B ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON- METALS; APPARATUS THEREFOR 134
 
  
 
H05K PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS 1155

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
9199540 Current collector strip for a sliding contact deviceSep 28, 11Dec 01, 15[B60L]
9120386 Sensor element for a sensor deviceNov 12, 10Sep 01, 15[B60L]
8427027 Brush unit for an electric machine, spring and seal arrangement for the same, and method for the production thereofDec 05, 08Apr 23, 13[H02K]
8226806 Electrode for electrolysisJul 17, 09Jul 24, 12[C25B]
6027823 Molded article of metal matrix composite, and method for making such an articleJul 08, 96Feb 22, 00[C03C, B21D, B32B]
5890530 Method of making MMC componentsJun 19, 96Apr 06, 99[B22D]
5787960 Method of making metal matrix compositesMar 13, 97Aug 04, 98[B22D]
5630973 Process for producing sliding bodies for electric collectorsApr 05, 95May 20, 97[C04B]
5347426 Electronic device including a passive electronic componentSep 09, 93Sep 13, 94[H05K]
5285126 Collector shoe and method for producing itJun 18, 91Feb 08, 94[H02K]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2012/0291,277 METHOD FOR ESTABLISHING A SEALED CONNECTIONAbandonedDec 02, 10Nov 22, 12[H01R]
2006/0260,436 Carbon brush and method and material for the production thereofAbandonedJun 15, 06Nov 23, 06[B22F]
6745930 Method of attaching a body made of metal matrix composite (MMC) material or copper to a ceramic memberExpiredFeb 19, 02Jun 08, 04[B23K]
6699410 Method of impregnating porous workpiecesExpiredMay 31, 01Mar 02, 04[C01B, B22D]
6009987 Collector shoe for collector and process for producing itExpiredOct 09, 98Jan 04, 00[B60L]
5878854 Collector shoe for collector and process for producing itExpiredMar 20, 97Mar 09, 99[B60L]
5263562 Carbon brush for collectorExpiredDec 11, 90Nov 23, 93[H01R, B60L]
5189903 Sliding strip for collector with rupture detection deviceExpiredDec 17, 90Mar 02, 93[G01M, B60L]
5152380 Collector shoe for collector and process for producing itExpiredDec 12, 90Oct 06, 92[B60L]
5114351 Sliding contact arrangement for carbon brushesExpiredApr 27, 90May 19, 92[H01R]

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