×

Timing system and device and method for making the same

  • US 6,801,477 B2
  • Filed: 12/13/2002
  • Issued: 10/05/2004
  • Est. Priority Date: 12/13/2001
  • Status: Active Grant
First Claim
Patent Images

1. A device comprising:

  • a. a lens;

    b. a base with a marking thereon; and

    c. means for altering visibility of the marking on the base through the lens and thereby indicating a passage of time, wherein the means for altering visibility of the marking on the base comprises an optical medium positioned between the lens and the base.

View all claims
  • 6 Assignments
Timeline View
Assignment View
    ×
    ×