Search the Insulator Patent Reference Library:

Build your search criteria. The patent must match all the values specified.
Select patent types: Utility   Design   Reissue
Patent number:
Date:
Year between: and
Patentee starting with:
City:
State:
Assigned To starting with:
Description containing:
Category:
Class:    Subclass:
Click Search when complete:
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 = '425') AND (category.subclass = '324.1') ORDER BY date ASC, patent, type

Total of 4 patents found where: Class is '425'; Subclass is '324.1';

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
 1930
U 1,779,811 October 28, 1930 Method of Manufacturing Insulators
Press for making skirts/petticoats in one-piece porcelain (replaces casting)
HARVEY, William F.
Press  
 1936
U 2,034,707 March 24, 1936 Apparatus for Making One-Piece Insulators
Machine to press out the form and trim the profile in large unipart insulators
BENARD, Arthur G.
Manufacturing Locke Insulator Corp.
 1937
U 2,068,941 January 26, 1937 Process and Apparatus for Manufacturing Insulators
Plunger to first form the pinhole in a porcelain insulator by first plunging a pinhole without threads then form the threads
BOVARD, Floyd G.
Press The Ohio Brass Co.
 1946
U 2,395,295 February 19, 1946 Method of Producing Insulators
Improved method of jiggering and plunging
ROWLAND, Davidge H.
Manufacturing  

Total of 0.00 seconds