New Patents, Plunger for Pressing Glass

[Trade Journal]

Publication: Crockery & Glass Journal

New York, NY, United States
vol. 20, no. 6, p. 28, col. 1


Issued by the United States Patent Office, July 1, 1884.

PLUNGER FOR PRESSING GLASS. Washington Beck, Pittsburgh, Pa.




Claim, 1. A plunger for forming or pressing glass articles, made of plaster-of-paris or other similar material.

2. A plunger for pressing or forming glass articles having an irregular or uneven interior, made of plaster-of-paris or other like material, and having an internal support, by which said plunger is strengthened and secured to the piston of the press.

3. The method herein described of forming articles of glass having an irregular interior by pressing in a mold with a plunger made of plaster-of-paris, or its described equivalent, and after the article has set or hardened removing said plunger in pieces or fragments from the article.


Researcher notes: 
Supplemental information: Patent: 301,329
Researcher:Bob Stahr
Date completed:February 10, 2008 by: Bob Stahr;