FR721059A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Snap-action shutter for tubes with powdery or granular solids circulating
Assignee: Alfred Dubois
•
Filing: 1931-08-04
•
Granted: 1932-02-27
•
Expires: 1951-08-04
Abstract
No abstract record available.
Inventors
- 👤 Alfred Dubois
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-29 19:16
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/56
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.