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Larson Corporation

Lester M Larson

Peter M Larson

Materials and items made of thermoplastic polyesters, such as poly (epsilon-caprolactone), synthetic rubber, such as Transpolyisoprene and Neoprene, and natural rubber, such as balata have improved properties when subjected to gamma radiation in the range from 0.5 to 30 megarads.

Gamma radiation treated material

Orthopedic splint materials made with thermoplastic polyester, particularly poly (epsilon-caprolactone) with a molecular weight of over 5,000 and melting between 50.degree. C. and 100.degree. C. have improved properties when subjected to gamma radiation in the range from 0.5 to 30 megarads.

Gamma radiation treated sheet material for use as orthopedic splints and

Heat softened polydienic sheets, such as transpolyisoprene or polychloroprene, are usefully mounted in rolls, the layers being separated by powders or granules such as salt to prevent cohesion, and the salt is preferably dusted off as used, or the sheet is passed through a warm water bath which will remove the salt and warm it and softening to an applying state useful for many purposes. It can be shaped as an in-sole for shoes and upon softening will accept the shape of the wearer's foot greatly improving the comfort; or as breast plates, athletic supporters, knee guards, head guards such as a helmet, ear guards or ear supports which may carry sound transfer means, i.e., such as headphones or a hearing aid; or it may be used as a bandage and for which purpose it can be reinforced by a long fiber and the comfort of the plastic bandage can be modified as by having perforations filled with fiber to transmit moisture from side to side.

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Sun City West, AZ, United States of America

Lester M Larson