Expired, full termArchiveSolo inventor
Building material and process of making same
US 1,865,634 A · Inventors: LESTER KIRSCHBRAUN
Overview
The published document from the USPTO: abstract, claims, description and drawings. Open it full size
Read the whole patent
Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 5, 1932. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by July 5, 1949.
- We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMarch 2, 1931
GrantedJuly 5, 1932
Term endedJuly 5, 1949
Application number—
Classification (CPC)D06N5/00 +2 more
Length9 pages
Sources & verification
Official USPTO records
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Everything on this page comes from the USPTO record linked above.