Expired, full termArchiveSolo inventor
Novel artificial silk effects and process of producing same
US 1,998,577 A · Inventors: GEORGES HEBERLEIN
Overview
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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 April 23, 1935. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by April 23, 1952.
- We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
Filed—
GrantedApril 23, 1935
Term endedApril 23, 1952
Application number—
Classification (CPC)D06M11/62 +2 more
Length3 pages
Sources & verification
Official USPTO records
Cross-check elsewhere
Everything on this page comes from the USPTO record linked above.