FR683846A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Sound film and method and apparatus for its recording
Assignee: SELENOPHON LICHT und TONBILD G
•
Filing: 1929-10-23
•
Granted: 1930-06-18
•
Expires: 1949-10-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-23 01:35
CPC Classifications
G; G11; G11B; G11B7/00
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.