Patent US5055722A successfully refreshed from Google Patents.
Patent FR892653A successfully refreshed from Google Patents.
FR892653A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Improvements to rotary wing aircraft
Assignee: FR DU GYROPLANE SOC
•
Filing: 1942-10-20
•
Granted: 1944-05-16
•
Expires: 1962-10-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-29 11:12
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/52
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.