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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent WHERE (category = 'Metal') ORDER BY date ASC, patent, type

Total of 6 patents found where: Category is 'Metal';

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T / S Patent Date Description Patentee Category Assigned To
U Specimen known 8,418 October 14, 1851 Improvement in Insulators for Telegraph Wires
Metal or cast iron insulator with cupped dry area at bottom. Glass poured in with a conductor supporting iron rod embedded in the glass, and the cupped is coated or lined with glass, porcelain, or enamel. The bottom skirt is slanted inward 45 degrees to prevent water from splashing up inside wetting the interior surface. This feature was utilized in U-983 and U-984 made by the U. S. Pottery Co. in Bennington, VT.
U Specimen known 71,564 November 26, 1867 Improvement in Telegraph Insulators
Metal shell lined with glass or porcelain with wooden pin and paraffin cavity
WOOD, Merritt L.
Metal 2/3 to S. Porter & L. M. Monroe
U 310,059 December 30, 1884 Insulator
Metal plate to hold wire on side of insulator
JAMES, Hamilton L.
U 750,722 January 26, 1904 Insulator
Metal encased insulator with metal cap to hold cable (Brown p. 25)
U 849,731 April 9, 1907 Insulator
Metal crown cap
U Specimen known 1,988,369 January 15, 1935 Radio Interferenceproof Insulator
Metal cap cemented into recessed formed in top of pin type insulator
BROWN, Harold H.
Metal Locke Insulator Corp.

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