FR707728A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Improvements to the power supply of electrodynamic loudspeakers
Assignee: Andre Blondel
•
Filing: 1930-03-19
•
Granted: 1931-07-11
•
Expires: 1950-03-19
Abstract
No abstract record available.
Inventors
- 👤 Andre Blondel
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-05 19:17
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/22; H04R; H04R3/00; H04R3/04; H04R3/08
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.