Expired, full termArchiveSolo inventor
Valve construction
US 2,028,131 A · Inventors: BERRY PAUL F
Overview
1 drawing sheet
Every sheet is in the USPTO PDF.
Open the USPTO PDFRead 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 January 21, 1936. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by January 21, 1953.
- We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledOctober 27, 1932
GrantedJanuary 21, 1936
Term endedJanuary 21, 1953
Application number—
Classification (CPC)F04B39/08
Length4 pages
Sources & verification
Official USPTO records
Cross-check elsewhere
Everything on this page comes from the USPTO record linked above.