Alcuni brevetti della resina artificiale

- Method for making artificial rock, in particular large-scale rock imitations

"In order to manufacture low-weight, large-scale, artificial rocks resistant to weathering and faithfully rendered as in nature, first a malleable plastic reproduction is made of a natural-rock object. If called for, the reproduction is braced in a second method step, preferably by coating its back side with glass-fiber reinforced plastic. The work mold so manufactured receives a parting compound in a third operational step and thereupon preferably fiberglass mats are inserted and a coat of synthetic resin is applied to make a positive in the shape of a hollow artificial-rock blank. This artificial-rock blank is coated in a fourth operational step with a synthetic resin and fine-grain, preferably multicolored natural sand is deposited on or incorporated into the still moist coat of synthetic resin. Once this coat of synthetic resin with its incorporated natural sand has hardened, the artificial rock has been completed." (Estratto preso dal brevetto originale)

- Composite artificial tooth

"It has been found that the artificial composite teeth, as shown in copending Ser. No. 481,191, can be improved with respect to their grinding and adaptation characteristics by forming the composite tooth with only the labial (or buccal) and incisal (or occlusal) surfaces being made of poreclain with the entire, or a part, of the lingual and ridge lap portions of the tooth being made of dental plastic. In general, at least a portion of the ridge lap surface and the wall surfaces of the composite tooth extending therefrom advantageously comprise a synthetic dental plastic, or resin, material with the outer visual surface, labial or buccal, and the biting, or masticating surface, incisal or occlusal, being composed of dental ceramic material. The poreclain labial or buccal provides excellent esthetics, color stability, resistance to chemical attack and protects against loss of surface gloss while the porcelain incisal or occlusal portion provides excellent resistance to abrasive wear. On the other hand, the lingual and ridge lap areas being of plastic permits exceptional ease of alteration both lengthwise and in thickness, to provide space for an overbite, etc., as well as being chemically bondable to the denture base plastic.

Such a composite tooth allows ready alteration and ease of bonding to a synthetic resin denture base in addition to excellent strength characteristics." (Estratto preso dal sito)

"It has been found that the artificial composite teeth, as shown in copending Ser. No. 481,191, can be improved with respect to their grinding and adaptation characteristics by forming the composite tooth with only the labial (or buccal) and incisal (or occlusal) surfaces being made of poreclain with the entire, or a part, of the lingual and ridge lap portions of the tooth being made of dental plastic. In general, at least a portion of the ridge lap surface and the wall surfaces of the composite tooth extending therefrom advantageously comprise a synthetic dental plastic, or resin, material with the outer visual surface, labial or buccal, and the biting, or masticating surface, incisal or occlusal, being composed of dental ceramic material. The poreclain labial or buccal provides excellent esthetics, color stability, resistance to chemical attack and protects against loss of surface gloss while the porcelain incisal or occlusal portion provides excellent resistance to abrasive wear. On the other hand, the lingual and ridge lap areas being of plastic permits exceptional ease of alteration both lengthwise and in thickness, to provide space for an overbite, etc., as well as being chemically bondable to the denture base plastic.

Such a composite tooth allows ready alteration and ease of bonding to a synthetic resin denture base in addition to excellent strength characteristics." (Estratto preso dal sito)