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Inventor
FRANK WILLIAM H
US
3 patents
⚠️ This page may combine multiple inventors who share the name “FRANK WILLIAM H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
EMERSON ELECTRIC CO
2 patents
US5429207A
Jul 4, 1995
Rung lock and latch assembly for an extension ladder
EMERSON ELECTRIC CO
36 citations
89
US4177879A
Dec 11, 1979
Ladder and method of construction therefor
EMERSON ELECTRIC CO
7 citations
68
GREEN BULL INC
1 patent
US6578663B2
Jun 17, 2003
Step signal
GREEN BULL INC
20 citations
86