公开(公告)号：US3867165A

公开(公告)日：1975-02-18

申请号：US39948273

申请日：1973-09-21

Applicant: RCA CORP

Inventor： WILLIAMS RICHARD ,  WILLIS ALFRED HENRY

IPC: A61B5/117 ,  A61B5/10

CPC classification number: A61B5/1172

Abstract: A method of recording fingerprints whereby the finger is coated with a reducing agent, electro-oxidation products are generated on the ridges of the finger and the finger contacted with a recording substrate containing an indicator for the electrooxidation products.

Abstract translation: 一种记录指纹的方法，其中手指被还原剂涂覆，在手指和手指的脊上产生电氧化产物，该脊与含有电氧化产物的指示剂的记录基底接触。

公开(公告)号：US3660818A

公开(公告)日：1972-05-02

申请号：US3660818D

申请日：1970-05-04

Applicant: RCA CORP

Inventor： AMODEI JUAN JOSE ,  WILLIAMS RICHARD

IPC: G02F1/05 ,  G11C13/04 ,  G11C11/22

CPC classification number: G11C13/047 ,  G02F1/0525 ,  G02F1/0533

Abstract: Information is optically written onto the electrically charged surface of a transparent storage medium by directing light modulated with this information at this surface. The light partially discharges the charge and creates an electrical charge pattern which remains stored for long periods. The light either may be scanned across the surface to achieve sequential information storage or may be employed to write a large amount of information in parallel, for example in the form of a hologram. The stored information may be optically recovered by directing polarized light at the storage medium and employing a suitably oriented analyzer or, in the case of hologram storage, by wavefront reconstruction.

Abstract translation: 通过将该信息调制的光指向该表面，将信息光学地写入透明存储介质的带电表面。 光部分地释放电荷并产生长时间保存的电荷模式。 光可以扫描在表面上以实现顺序信息存储，或者可以用于平行地写入大量信息，例如以全息图的形式。 存储的信息可以通过在存储介质处引导偏振光并采用适当取向的分析器或者在全息存储的情况下通过波前重建来光学恢复。

公开(公告)号：US3579332A

公开(公告)日：1971-05-18

申请号：US3579332D

申请日：1968-05-27

Applicant: RCA CORP

Inventor： WILLIAMS RICHARD

IPC: G03G5/082 ,  G03G5/087 ,  G03G5/00

CPC classification number: G03G5/087 ,  G03G5/082

Abstract: AN IMPROVED ELECTROPHOTOGRAPHIC PLATE HAS A PHOTOCONDUCTIVE LAYER OF ONE OR MORE RELATIVELY LARGE WAFERS OF SINGLE-CRYSTAL, N-TYPE ZINC OXIDE. EACH WAFER IS FIXED TO, AND IN ELECTRICAL CONTACT WITH, AN ELECTRICALLY CONDUCTIVE BACKING. THE NOVEL METHOD OF CHARGING THE ELECTROPHOTOGRAPHIC PLATE COMPRISES (1) WETTING A MAJOR SURFACE OF THE ZINC OXIDE LAYER WITH A SOLUTION OF AN IONIZABLE SALT IN A RELATIVELY VOLATILE SOLVENT WHILE BIASING THE SOLUTION WITH A NEGATIVE VOLTAGE WITH RESPECT TO THE BACKING, AND (2) ALLOWING THE SOLVENT TO EVAPORATE, WHEREBY TO LEAVE AN ELECTROSTATIC CHARGE ON THE ZINC OXIDE SURFACE.