Inventor

YIP DOOGONG

US3 patents

⚠️ This page may combine multiple inventors who share the name “YIP DOOGONG”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

M & R MARKING SYSTEMS INC

2 patents

US7273009B2Sep 25, 2007

Marking structures for hand stamps

M & R MARKING SYSTEMS INC4 citations53

US7166395B2Jan 23, 2007

Method and system of processing stamps

M & R MARKING SYSTEMS INC0 citations48

TRODAT GMBH

1 patent

US7387068B2Jun 17, 2008

Methods of making multi-color ink stamps

TRODAT GMBH0 citations43