Episode 2 of 3
US Patent 224,665
- When
- 1880
- Where
- United States
In 1880, Edison obtained a further patent for the method of preparing autographic stencils using a file plate.
This patent covered the making of stencils using a grooved metal plate. The stencil was placed on the plate and perforated when written on with a blunt metal stylus. This development refined the practical application of the autographic printing process established by the earlier patent.
Sources
- Mimeograph Wikipedia, revision of 2026-10-08
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.