Inventor
HELLAND RANDALL H
US12 patents
⚠️ This page may combine multiple inventors who share the name “HELLAND RANDALL H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MINNESOTA MINING & MFG
9 patentsUS5258274ANov 2, 1993
Thermal dye bleach construction sensitive to ultraviolet radiation
MINNESOTA MINING & MFG85 citations95
US5380635AJan 10, 1995
Dihydroperimidine squarylium dyes as antihalation and acutance materials for photographic and photothermographic articles
MINNESOTA MINING & MFG59 citations94
US5135842AAug 4, 1992
Thermal dye bleach construction
MINNESOTA MINING & MFG40 citations92
US5314795AMay 24, 1994
Thermal-dye-bleach construction comprising a polymethine dye and a thermal carbanion-generating agent
MINNESOTA MINING & MFG34 citations91
US5395747AMar 7, 1995
Stabilized thermal-dye-bleach constructions
MINNESOTA MINING & MFG14 citations73
US5266452ANov 30, 1993
Photographic element containing a thermal dye bleach system
MINNESOTA MINING & MFG16 citations73
US5324627AJun 28, 1994
Tetra-alkylammonium phenylsulfonylacetate thermal-dye-bleach agents
MINNESOTA MINING & MFG10 citations72
US5384237AJan 24, 1995
Quaternary-ammonium phenylsulfonylacetate thermal-dye-bleach agents
MINNESOTA MINING & MFG3 citations61
US4681830AJul 21, 1987
Fluorinated carbon-containing developer composition
MINNESOTA MINING & MFG4 citations59