Headrest for alleviating whiplash injury and the use of...

Chairs and seats – Crash seat – Force-absorbing means incorporated into headrest area

Reexamination Certificate

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Details

C297SDIG011

Reexamination Certificate

active

07144081

ABSTRACT:
A headrest for alleviating whiplash injury and comprising at least one support member which is uprightly fixed to a seat and a cushioning member of polyurethane foam attached to said at least one support member and enclosed in a covering material is disclosed, wherein the polyurethane foam is one having the following properties: A) A density within the range of 50 to 100 kg/m3; B) a compressive strength between 0.9 and 3.5 mN/mm2at 25% deformation and between 1.3 and 4.5 mN/mm2at 40% deformation; C) a glass transition temperature, Tg (DSC), between −10° C. and +10° C., preferably −5° C. to +4° C.; D) a loss temperature peak maximum between 15 and 30° C.; E) a temperature range for the loss peak between −40° C. and +90° C.; and F) a loss peak area between 4.0 and 8.0.

REFERENCES:
patent: 4744601 (1988-05-01), Nakanishi
patent: 4919483 (1990-04-01), Horkey
patent: 5290091 (1994-03-01), Dellanno et al.
patent: 2002/0060482 (2002-05-01), Sakakibara et al.
patent: 19746413 (1998-04-01), None
patent: 10211840 (1997-11-01), None
patent: 11155879 (1997-11-01), None
patent: 300362 (1997-05-01), None
patent: WO 9944856 (1999-09-01), None
patent: WO 00/20248 (2000-04-01), None

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