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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 = '501') AND (category.subclass = '141') ORDER BY date ASC, patent, type

Total of 9 patents found where: Class is '501'; Subclass is '141';

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T / S Patent Date Description Patentee Category Assigned To
 1914
U Specimen known 1,120,951 December 15, 1914 Manufacture of Insulators for High Potential Electric Conductors
Boron used in porcelain insulators		 LOCKE, Fred M.
 Boron  
 1915
U 1,128,747 February 16, 1915 Method of Manufacturing Porcelain Insulators
Manufacturing process for porcelain insulator firing unglazed, then filling porous porcelain with oxidizable oil and rendering the oil stable with ozone to form a coating to replace expense of firing on a glaze		 BOEHM, Wilhelm
 Manufacturing  
U Specimen known 1,156,163 October 12, 1915 Manufacture of High Potential Electric Conductors
Boro-silicate glass & porcelain		 LOCKE, Fred M.
 Boron  
 1926
U 1,572,730 February 9, 1926 Batch for Making Ceramic Material and to a Ceramic Material Made Therefrom
Porcelain composition for insulator using manganese		 LOCKE, Fred M.
LOCKE, Fred J.
 Porcelain  
 1927
U 1,631,729 June 7, 1927 Ceramic Insulating Material
Porcelain composition for spark plugs and insulators consisting of Sillimanite and a glassy matrix		 JEFFERY, Joseph A.
MONTGOMERY, Earle T.
 Porcelain Champion Porcelain Co.
U 1,631,730 June 7, 1927 Ceramic Material
Porcelain composition for spark plugs and insulators consisting of Sillimanite		 JEFFERY, Joseph A.
MONTGOMERY, Earle T.
 Porcelain Champion Porcelain Co.
 1941
U 2,250,044 July 22, 1941 Insulator
Multipart insulator with glazed sanded surfaces to improve strength of cap		 CROSKEY, Carl D.
ROWLAND, Davidge H.
 Multipart Locke Insulator Corp.
 1943
U 2,337,691 December 28, 1943 Method of Making High Strength Ceramic Surfaces
Method of manufacturing insulators using porcelain ""sand"" with a lower coefficient of expansion than the insulator body to rough up the surface and provide a strong cement joint without reducing the effectiveness of the compression glaze (see 2,327,972)		 STETTINIUS, Kenneth E.
DEWEY, Benjamin F.
 Manufacturing Lapp Insulator Co., Inc.
 1944
U 2,346,620 April 11, 1944 Method of Forming Insulator Bodies
Method to mix water with dry ingredients to form clay of the proper water content		 SKIPPER, Edward M.
 Clay Locke Insulator Corp.

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