CIRCULAR VARIABLE FILTER

• US 3,442,572 A
• Filed: 08/25/1964
• Issued: 05/06/1969
• Est. Priority Date: 08/25/1964
• Status: Expired due to Term

• Current Assignee: Alfred J. Thelen, Joseph H. Apfel, Rolf F. Illsley
• Original Assignee: Alfred J. Thelen, Joseph H. Apfel, Rolf F. Illsley
• Inventors: Illsley, Rolf F., Thelen, Alfred J., Apfel, Joseph H.
• Application Number:
  US04/391,928
• Time in Patent Office: 1,715 Days
• US Class Current: 359/578
• CPC Class Codes: C23C 14/044 using masks to redistribute rather than totally prevent coating, e.g. producing thickness gradient
• CPC Class Codes: G01J 3/12 Generating the spectrum; Monochromators
• CPC Class Codes: G02B 26/007 the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
• CPC Class Codes: G02B 5/20 Filters polarising elements G02B5/30
• CPC Class Codes: G02B 5/285 comprising deposited thin solid films G02B5/281 - G02B5/289 take precedence; multilayered film filters for fibre optic multiplexing G02B6/29361

Claims