|SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '307') AND (category.subclass = '90') ORDER BY assigned_to ASC, date, patent, type|
Total of 1 patents found where: Class is '307'; Subclass is '90';
View a patent by clicking on the patent number. You can sort by any of the columns by clicking on the column name.
|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||224,580||February 17, 1880||Induced Current Guard for Electrical Conductors
Pre-transposition technique to eliminate induced current on telephone and telegraph wires
|CHINNOCK, Charles E.
Total of 0.00 seconds