Patent US4489844A successfully refreshed from Google Patents.
Patent DE646458C successfully refreshed from Google Patents.
DE646458C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Device for the production of wall perforations in pipes made of clay or the like
Assignee: Individual
•
Filing: 1935-01-01
•
Granted: 1937-06-14
•
Expires: 1955-01-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-05 11:05
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/52; B28B21/54
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.