P

Inventor

FRENCH DAVID W

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

JOHNS MANVILLE

5 patents
US4258935AMar 31, 1981

Bell end of a bell and spigot joint

JOHNS MANVILLE40 citations86
US4315630AFeb 16, 1982

Sealing ring for spigot and socket pipe joint

JOHNS MANVILLE24 citations76
US4231983ANov 4, 1980

Plastic pipe joint and method and assembly for making same

JOHNS MANVILLE8 citations72
US4170448AOct 9, 1979

Assembly for forming the bell of a bell spigot joint

JOHNS MANVILLE18 citations72
US4207283AJun 10, 1980

Method of post thickening one end section of a plastic pipe

JOHNS MANVILLE8 citations62

J M MANUFACTURING CO INC

1 patent
US4522578AJun 11, 1985

Apparatus for introducing a foamable plastic insulation into the space defined by an inner core pipe and an outer casing pipe while maintaining the spacing of the pipes

J M MANUFACTURING CO INC37 citations86

HILTON HOSPITALITY INC

1 patent
USD501194SJan 25, 2005

Clock radio

HILTON HOSPITALITY INC8 citations61

MANVILLE SERVICE CORP

1 patent
US4579078AApr 1, 1986

Sizing applicator

MANVILLE SERVICE CORP6 citations57