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

Total of 3 patents found where: Category is 'Helical';

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T / S Patent Date Description Patentee Category Assigned To
U 1,894,292 January 17, 1933 Strain Insulator
Helical strain insulator
CRAMER, Walter
Helical Locke Insulator Corp.
U 1,942,284 January 2, 1934 Electric Insulator
Helical grooves on top surface of suspension insulator
HALTON, Geoffrey H.
Helical Steatite & Porc. Prod. Ltd.
U 2,155,848 April 25, 1939 Insulator
Helical suspension & helical post type
Helical The Ohio Brass Co.

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