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 WHERE (category = 'Vacuum') ORDER BY date ASC, patent, type

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

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
 1922
U Specimen known 1,424,924 August 8, 1922 Method of Producing Clay Bodies
Vacuum process for removing air from the clay. Patent was owned by Lapp Insulator Co.
LAPP, Grover W.
Vacuum  
 1925
U 1,561,002 November 10, 1925 Method of Producing Clay Bodies and Apparatus Used
Vacuum process for removing air from the clay
LAPP, Grover W.
Vacuum Lapp Insulator Co., Inc.
 1926
U 1,589,617 June 22, 1926 Process for Preparing Material for Ceramic Articles
Vacuum pugging after mixing dry ingredients with exact percent water needed
AUSTIN, Arthur O.
Vacuum The Ohio Brass Co.

Total of 0.01 seconds