Patent · US Active

Opacity changing peep sight

US8544180B2 · kind B2 · utility

7Cited by
10References
15Claims
0Family size

Inventor

Key dates

Filing dateDec 5, 2011
Grant dateOct 1, 2013
Priority date—
Expiry dateMay 30, 2032

Classification

  • Technology area (CPC F)Mechanical Engineering; Lighting; Heating
  • CPC primaryF41G1/467
  • WIPO fieldOther special machines
  • WIPO sectorMechanical engineering

Abstract

An opacity changing peep sight device is disclosed wherein the peep sight comprises a photochromic substance sensitive to UV light. When there is plenty of available UV light, the peep sight becomes substantially opaque. When there is little available UV light, the peep sight becomes substantially translucent. Other embodiments are described and claimed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.