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US 1,689,340 A · Inventors: HEARN JOHN 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 October 30, 1928. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by October 30, 1945.
- We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledNovember 14, 1923
GrantedOctober 30, 1928
Term endedOctober 30, 1945
Application number—
Classification (CPC)H01H67/06 +2 more
Length3 pages
Sources & verification
Official USPTO records
Cross-check elsewhere
Everything on this page comes from the USPTO record linked above.