Transparent scratchproof closure element for a watch case and wa

Details Transparent scratchproof closure element for a watch case and wa Transparent scratchproof closure element for a watch case and wa

1995-12-01

1997-12-16

Turner, Archene

Horology: time measuring systems or devices

Cases

With protection means

368280, 368316, 428698, G02B 100, C04B 3558

Patent

active

056993250

ABSTRACT:
The invention concerns a transparent scratchproof watch case closure element, characterized in that it is realized by sintering a pressed part or a injected part having a general shape similar to that of said closure element, said part being essentially formed of a powder or a mixture of powders of ceramic material and in that said closure element is transparent in the visible spectrum.

REFERENCES:
patent: 4481300 (1984-11-01), Hartnett et al.
patent: 4511665 (1985-04-01), Nagato et al.
patent: 4788167 (1988-11-01), Mathers et al.
patent: 4855264 (1989-08-01), Mathers et al.
patent: 5096862 (1992-03-01), Mathers et al.
patent: 5231062 (1993-07-01), Mathers et al.

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