DE640872C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Arrangement for the excitation of synchronous machines
Assignee: Siemens Schuckertwerke AG
•
Filing: 1933-06-03
•
Granted: 1937-01-14
•
Expires: 1953-06-03
Abstract
No abstract record available.
Inventors
- 👤 Dipl-Ing Richard Helbing
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-02 02:11
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/10; H02P9/102
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.