Removable inserts for pipe passages in concrete
United States Patent 2968855
US Patent References:
/0427914.html
- - 0427914

Mold
- - 1391988

Contractible core
- - 1396280

Building unit
- - 2138015

Device for forming passages in concrete
- - 2234784


Inventors:
Stolz, William J.
Publication Date:
01/24/1961
View Patent Images:
Download PDF 2968855 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
Stolz, William J.
Primary Class:
249/179
Other Classes:
249/177, 249/183
International Classes:
E04G15/06; E04G15/00
US Patent References:
2311358Apparatus and method for molding concrete
2527874Apparatus for use in installing soil pipe in concrete floors
2720017Method of erecting buildings
2721369Method of concrete floor construction