Inventor
KAY RALPH
GB11 patents
⚠️ This page may combine multiple inventors who share the name “KAY RALPH”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RUE DE INT LTD
6 patentsUS7054042B2May 30, 2006
Optically variable security device
RUE DE INT LTD67 citations97
US6903850B2Jun 7, 2005
Security device
RUE DE INT LTD74 citations97
US5851615ADec 22, 1998
Tamper indicating security item and joining method
RUE DE INT LTD52 citations95
US6712399B1Mar 30, 2004
Security device
RUE DE INT LTD126 citations94
US6364983B1Apr 2, 2002
Manufacture of security tapes and security threads
RUE DE INT LTD27 citations92
US6344245B1Feb 5, 2002
Security device manufacture
RUE DE INT LTD12 citations73
DE LA RUE HOLOGRAPHICS LTD
4 patentsUS5492370AFeb 20, 1996
Decorative article
DE LA RUE HOLOGRAPHICS LTD248 citations96
US5310222AMay 10, 1994
Optical device
DE LA RUE HOLOGRAPHICS LTD169 citations96
US5319475AJun 7, 1994
Tamper resisting holographic security seal
DE LA RUE HOLOGRAPHICS LTD121 citations94
US5665194ASep 9, 1997
Image enhancement
DE LA RUE HOLOGRAPHICS LTD16 citations73