Cryogenic treatment methods

Details Cryogenic treatment methods Cryogenic treatment methods

1990-10-11

1993-01-19

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

8158, 43124, 62 521, 134 2212, 134 37, F25D 1702

Patent

active

051798409

ABSTRACT:
An article such as a mattress, carpet or curtain is treated by spraying its surface with liquid cryogen (usually liquid nitrogen). The liquid nitrogen acts as an acaricide and kills house dust mites. The dead mites are then removed from the freshly sprayed fabric. Such a treatment is also effective in dislodging particles of dirt from the articles and may be used for example to clean a carpet in situ. After treatment with the liquid nitrogen, the carpet may be subjected to a conventional vacuum cleaning.

REFERENCES:
patent: 3874926 (1975-04-01), Horne et al.
patent: 4624070 (1986-11-01), Query et al.
patent: 4720889 (1988-01-01), Grave
patent: 4972677 (1990-11-01), Moriya et al.
patent: 5027546 (1991-07-01), Tallon
M. J. Colloff, "Use of Liquid Nitrogen in the Control of House Dust Mite Population", Clinical Allergy, vol. 16, pp. 41-47 (1986).
British Oxygen Co., Cryogenics, "LN.sub.2 Frees the Downtrodden", Guilford GB, vol. 13, No. 5 (May 1973).

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