Patent FR2012571A1 successfully refreshed from Google Patents.
DE659079C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Screw connection between drill rod and drill bit for rock percussion drill
Assignee: HERMANN PRAGER
•
Filing: 1935-09-19
•
Granted: 1938-11-24
•
Expires: 1955-09-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-05 07:22
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042
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.