Expired, full termArchiveSolo inventor
Centrifugal fluid cleaner
US 1,721,908 A · Inventors: HEIST CHARLES H
Overview
1 drawing sheet
Every sheet is in the USPTO PDF.
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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 23, 1929. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by July 23, 1946.
- We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMarch 19, 1926
GrantedJuly 23, 1929
Term endedJuly 23, 1946
Application number—
Classification (CPC)B04C1/00 +1 more
Length3 pages
Sources & verification
Official USPTO records
Cross-check elsewhere
Everything on this page comes from the USPTO record linked above.