CH229074A
Expired / Lapsed
CH
⏱️ 0.0 years remaining
Portable device for the perception of sounds.
Assignee: Luthy Robert
•
Filing: 1942-08-31
•
Granted: —
•
Expires: 1962-08-31
Abstract
No abstract record available.
Inventors
- 👤 Luthy Robert
Bibliographic Details
Application Number
—
Jurisdiction
CH
Data Source
google_patents
Last Synchronized
2026-10-28 11:41
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/604; H04R2460/00; H04R2460/13
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.