AT263871B
Expired / Lapsed
AT
⏱️ 0.0 years remaining
Microphone combination with an amplifier circuit, consisting of two microphone groups, which are connected to the amplifier circuit with opposite polarity
Assignee: Philips Nv
•
Filing: 1965-05-17
•
Granted: 1968-08-12
•
Expires: 1985-05-17
Abstract
No abstract record available.
Inventors
- 👤 Kleis Derk
- 👤 Hermanus Iding Wilhelmus
Bibliographic Details
Application Number
—
Jurisdiction
AT
Data Source
google_patents
Last Synchronized
2026-10-31 11:31
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/12; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/406; H04R19/00; H04R19/04; H04R3/005
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.