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

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

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T / S Patent Date Description Patentee Category Assigned To
 1913
U 1,065,737 June 24, 1913 Insulator and Support
Spiral conical insulator for tightening of line wire
SLONECKER, Abiram J.
Spiral  
 1932
U Specimen known 1,869,397 August 2, 1932 Insulator
Insulator with spiral or helical grooves to all rain to wash the surface better
STROUP, Charles L.
Spiral  
 1957
U 2,776,332 January 1, 1957 Self-Cleaning Outdoor High Tension Insulators
Spiral or helical side petticoats that are washed by rain
VON CRON, Hans
Spiral Siemens-Schuckertwerke Aktiengesellschaft

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