FR816808A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Device for obtaining a clear telephone conversation in a noisy enclosure or hectic atmosphere
Assignee: Societe des Telephones Ericsson SA
•
Filing: 1936-04-21
•
Granted: 1937-08-18
•
Expires: 1956-04-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-04 17:09
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/19
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.