DE740896C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Device for sound reproduction or recording
Assignee: Siemens Corp
•
Filing: 1940-01-26
•
Granted: 1944-10-11
•
Expires: 1960-01-26
Abstract
No abstract record available.
Inventors
- 👤 Alexander Schaaf
- 👤 Achim Rainer
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-10-27 10:33
CPC Classifications
—
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1322890A
Cited
GB191400438A
Cited
US1425966A
Cited
US1746004A
Cited
DE564537C
Cited
GB419589A
Cited
US2144566A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.