The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 1984
Filed:
Nov. 03, 1980
Applicant:
Inventors:
Werner Handl, Altdorf, DE;
Rupert Englbrecht, Burghausen, DE;
Assignee:
Firma J. S. Staedtler, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B43L / ; B29D / ; C08J / ;
U.S. Cl.
CPC ...
15424 ; 264 26 ; 264 50 ; 264D / ; 425 / ; 425 / ; 521 74 ;
Abstract
Uniformly porous foamed erasers and process for the production thereof, the process comprising continuously mixing air or other gas into a flowable plasticized mixture and gelling the mixture by introducing the same continuously to a heating mean.