Relief pattern impressing apparatus

Details Relief pattern impressing apparatus Relief pattern impressing apparatus

1977-06-27

1978-11-14

Goldberg, Elliot A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219216, 219243, 219244, 350 361, 350 369, B29C 1700

Patent

active

041257600

ABSTRACT:
An apparatus for impressing relief patterns of high resolution, particularly phased holograms or phased diffraction gratings, in a thermoplastic information carrier, comprises a heatable impressing matrix in strip form, which carries the relief pattern and which, together with the information carrier, is passed between two calender rollers, the impressing matrix being adapted to be heated by a current flowing through it.

REFERENCES:
patent: 2355391 (1944-08-01), Nelson et al.
patent: 2556008 (1951-06-01), Spalding
patent: 2858633 (1958-11-01), Kane
patent: 3367261 (1968-02-01), Kashiwagi
patent: 3666247 (1972-05-01), Banks
patent: 3758649 (1973-09-01), Frattarola
patent: 3882207 (1975-05-01), Hannan et al.

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