Title:
Face masks
United States Patent 3101709


Inventors:
Gruenewaelder, Lou A.
Application Number:
US80445959A
Publication Date:
08/27/1963
Filing Date:
04/06/1959
Assignee:
Gruenewaelder, Lou A.
Primary Class:
Other Classes:
55/522
International Classes:
A41D13/11
View Patent Images:
US Patent References:
2810721Quaternary ammonium compounds1957-10-22
2770241Tobacco smoke filter and method1956-11-13
2733776N/A1956-02-07
2682315Gas filter1954-06-29
2081779Face mask1937-05-25
1292096N/A1919-01-21
0535718N/A1895-03-12