FR886835A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Tool with hard metal coating or recessing for high mechanical stresses, in particular for drilling rocks by percussion
Assignee: WALLRAM HARTMETALLWERK und HAR
•
Filing: 1942-10-16
•
Granted: 1943-10-26
•
Expires: 1962-10-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-05 18:24
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58; E21B10/36
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.