FR866833A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Sound recording system
Assignee: RCA Corp
•
Filing: 1940-08-20
•
Granted: 1941-09-08
•
Expires: 1960-08-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-05 14:01
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.