Capsular products (US Patent 4137194)

Patent number: 4137194 Granted: 1979-01-30 Filed: 1969-06-25 Inventors: William J. McCune, Jr. (South Lincoln, MA, US) Assignees: Polaroid Corporation (Cambridge, MA, US)

Abstract

Microscopic capsules comprising a nucleus surrounded by a film-forming polymeric layer having a substantially continuous light-reflecting metallic coating thereover.

Claims

1. Microscopic capsules consisting essentially of a substantially continuous film-forming polymeric layer surrounding a nucleus comprising a color-providing substance, said polymeric layer having