Patent DE2417263A1 successfully refreshed from Google Patents.
FR568739A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Film for cinematographic phono-scenes
Assignee: Lee De Forest
•
Filing: 1923-07-17
•
Granted: 1924-03-31
•
Expires: 1943-07-17
Abstract
No abstract record available.
Inventors
- 👤 Lee De Forest
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-22 20:23
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.