Watch crystal including a lens and manufacturing method for such a lens

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6406769
SERIAL NO

09275403

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The invention concerns a watch crystal (1) made of hard mineral material, in particular a crystalline material such as corundum, sapphire or spinel, including a non-circular optical lens (4) shaped in the thickness of the material of the crystal. The lens is formed by machining and polishing a recess (5) preferably situated in the lower face (3) of the crystal. Its contour can have reentering angles, and can be for example rectangular. The machining is effected by means of a brush which hits the bottom of the recess with the addition of a polishing medium.

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Patent Owner(s)

Patent OwnerAddress
COMADUR S ASWISS LOCO LE LOCLE NEUCHATEL

International Classification(s)

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  • 1999 Application Filing Year
  • G04B Class
  • 148 Applications Filed
  • 70 Patents Issued To-Date
  • 47.30 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances19992000200120022003200420050255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Delabre, Guy Portalban, CH 2 59

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Patent Citation Ranking

  • 49 Citation Count
  • G04B Class
  • 95.79 % this patent is cited more than
  • 23 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges559224112101 - 1011 - 2021 - 3031 - 4041 - 5071 - 80100 +05101520253035404550556065

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