Patent FR862934A successfully refreshed from Google Patents.
FR862934A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Advanced optical viewfinder
Assignee: Joseph Bernard Antoine Boysson
•
Filing: 1939-09-12
•
Granted: 1941-03-19
•
Expires: 1959-09-12
Abstract
No abstract record available.
Inventors
- 👤 Joseph Bernard Antoine Boysson
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-25 18:58
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/14
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.