Thermal insulation structure

Details Thermal insulation structure Thermal insulation structure

1975-01-13

1979-02-13

Phillips, Charles E.

Pipes and tubular conduits

Distinct layers

With intermediate insulation layer

138DIG9, 62465, F16L 914

Patent

active

041390245

ABSTRACT:
A double-walled, hermetically sealed structure with the cavity between the walls containing a polyurethane foam blown with a fluorinated hydrocarbon. During fabrication the cavity is evacuated to remove air and water vapor and then refilled with a fluorinated hydrocarbon.

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patent: 3531233 (1970-09-01), Max
patent: 3554237 (1971-01-01), Pelley et al.
patent: 3556158 (1971-01-01), Schneider
patent: 3693665 (1972-09-01), Veerling et al.
patent: 3728187 (1973-04-01), Martin

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