DE902015C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Hyperbaric loudspeaker
Assignee: Klangfilm GmbH
•
Filing: 1940-09-04
•
Granted: 1954-01-18
•
Expires: 1960-09-04
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Roesch
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-03 17:51
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE527965C
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.