Patent FR22446E successfully refreshed from Google Patents.
FR22446E
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Blasthole digging machine
Assignee: Individual
•
Filing: 1918-04-22
•
Granted: 1921-07-12
•
Expires: 1938-04-22
Abstract
No abstract record available.
Inventors
- 👤 Frederic Guillierme
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-31 22:46
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/003; E21B7/005; E21B11/00; E21B11/005; E21B7/001
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.