Martin E Hellman, Ralph C Merkle: Public key cryptographic apparatus and method. The Board of Trustees of the Leland Stanford Junior University, August 19, 1980: US04218582 (520 worldwide citation)

A cryptographic system transmits a computationally secure cryptogram that is generated from a publicly known transformation of the message sent by the transmitter; the cryptogram is again transformed by the authorized receiver using a secret reciprocal transformation to reproduce the message sent. T ...

Theodor E Bart, Ronald A Mills: TV Graphics and mixing control. RCA Corporation, Eugene M Whitacre, W H Meagher, Ronald H Kurdyla, August 19, 1980: US04218698 (275 worldwide citation)

A system employed in a television receiver for decoding and displaying graphics information such as may be encoded on a broadcast video signal. The system includes a graphics signal decoder supplied with the encoded video signal, and a plurality of transmission gates responsive to logic control sign ...

Alfred L March: Hemostatic clip. Gustave Miller, August 19, 1980: US04217902 (244 worldwide citation)

This is a hemostatic clip for clasping the flaps of a wound together and holding them together to prevent bleeding and to promote healing until the wound is healed and in closed position, whereupon it is released. It is made in a generally tubular body form with a longitudinal slit having cooperatin ...

Christian Weber, Hermann Schafer: Rim process for the production of elastic moldings. Bayer Aktiengesellschaft, Gene Harsh, Joseph C Gil, R Brent Olson, August 19, 1980: US04218543 (218 worldwide citation)

The instant invention relates to a one-step process for the production of elastomeric moldings which have a compact surface by the technique of reaction injection molding, using highly reactive systems of specific polyisocyanates, polyhydroxyl compounds and specific active aromatic polyamines. The i ...

Jean Pierre Bex, Claude Mantel: Prosthesis for use in valvuloplasty. Societe d Utilisation Scientifique et Industrielle du Froid Usifroid, Browdy and Neimark, August 19, 1980: US04217665 (203 worldwide citation)

A prosthesis for use in valvuloplasty. The prosthesis is formed as a linear educer made of a material which is compatible with implantation and which in its direction of length is incompressible and inextensible but in the direction of its width is sufficiently flexible to assume a radius of curvatu ...

Byron A Donzis: Self-contained fluid pressure foot support device. Arnold White & Durkee, August 19, 1980: US04217705 (195 worldwide citation)

A device which supports and cushions the human foot by means of fluid pressure is disclosed. The device is non-elastic and self-supporting. Two superimposed plies of a fluid impervious woven fabric material are sealed to each other around the periphery and, according to predetermined design, at sele ...

Joseph M Faso: Prosthesis and method for creating a stoma. August 19, 1980: US04217664 (186 worldwide citation)

A prosthesis and a method for implantation of a prosthesis in the body to cooperate with a body duct to provide a stoma. The prosthesis is particularly characterized by a mesh sleeve, a relatively rigid spout having a proximal end disposed in an opening in the body and a distal end projecting outsid ...

Bernard Jacquet, Gerard Lang: Quaternized polymer for use as a cosmetic agent in cosmetic compositions for the hair and skin. L Oreal, Cushman Darby & Cushman, August 19, 1980: US04217914 (171 worldwide citation)

A quaternized polymer for use as a hair or skin cosmetic agent, has recurring units of the formula ##STR1## wherein R is lower alkyl or --CH.sub.2 --CH.sub.2 OH;

Stephen M Matyas, Carl H W Meyer: Method for authenticating the identity of a user of an information system. International Business Machines Corporation, Edwin Lester, August 19, 1980: US04218738 (166 worldwide citation)

Secure hardware is provided for cryptographically generating a verification pattern which is a function of a potential computer user's identity number, the potential computer user's separately entered password, and a stored test pattern. The test pattern for each authorized computer user is generate ...

Chedomir Radovan, Rudolf R Schulte: Flap development device and method of progressively increasing skin area. Heyer Schulte Corporation, Larry N Barger, August 19, 1980: US04217889 (149 worldwide citation)

An expansion device for temporary implantation beneath the skin and subcutaneous layer, there to be enlarged whereby to increase the surface area of tissue which overlays it, to provide a flap for use in plastic and reconstructive surgery. The device comprises an envelope with a substantially non-ex ...