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US 2,028,811 A · Inventors: SIMMONS LEON E
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 January 28, 1936. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by January 28, 1953.
- We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJune 27, 1933
GrantedJanuary 28, 1936
Term endedJanuary 28, 1953
Application number—
Classification (CPC)E21C35/1933
Length3 pages
Sources & verification
Official USPTO records
Cross-check elsewhere
Everything on this page comes from the USPTO record linked above.