FR584932A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Speakerphone
Assignee: Edouard-Henri-Franco Chateau
•
Filing: 1924-05-20
•
Granted: 1925-02-18
•
Expires: 1944-05-20
Abstract
No abstract record available.
Inventors
- 👤 Edouard-Henri-Franco Chateau
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-29 20:39
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R7/06; H04R7/10
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.