Ultraviolet-transmitting window for a PROM

Details Ultraviolet-transmitting window for a PROM Ultraviolet-transmitting window for a PROM

1975-04-17

1977-02-22

Nelms, David C.

65 59B, G02B 520

Patent

active

040089452

ABSTRACT:
An ultraviolet-transmitting glass window assembly comprising a metallic mounting ring containing an ultraviolet-transmitting glass is made by placing a preformed ultraviolet-transmitting glass member in the center of the metallic ring which has a higher coefficient of thermal expansion than the glass, heating the resulting assembly to melt the glass whereby it completely fills the ring, and cooling the assembly whereby a compression seal is achieved due to the greater shrinkage of the metallic ring. This window assembly is sealed over the memory chip of a programmable read only memory package to provide for ultraviolet erasure of the program information stored in the memory device.

REFERENCES:
patent: 2773289 (1956-12-01), Martin et al.
patent: 3035372 (1962-05-01), Mayers
patent: 3225132 (1965-12-01), Baas et al.
patent: 3347651 (1967-10-01), Lueck
patent: 3356466 (1967-12-01), Wildeboer et al.
patent: 3582300 (1971-06-01), Coombes et al.
patent: 3598556 (1971-08-01), Hunt

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