Inventor
ODILL FRANK J
US4 patents
Patents
4 patentsUS4469467ASep 4, 1984
Manhole chimney seal
CRETEX CO INC94 citations94
US5496128AMar 5, 1996
Adjustable fastening band for a manhole chimney seal and method of using
CRETEX CO INC54 citations93
US5209601AMay 11, 1993
Manhole grade adjusting ring and method
CRETEX CO INC66 citations93
US4475845AOct 9, 1984
External manhole chimney seal
CRETEX CO INC51 citations90