Patent US4634552A successfully refreshed from Google Patents.
Patent CH309673A successfully refreshed from Google Patents.
CH309673A
Expired / Lapsed
CH
⏱️ 0.0 years remaining
Device for damping engine exhaust noise.
Assignee: Wilman Sigismond
•
Filing: 1953-04-07
•
Granted: —
•
Expires: 1973-04-07
Abstract
No abstract record available.
Inventors
- 👤 Wilman Sigismond
Bibliographic Details
Application Number
—
Jurisdiction
CH
Data Source
google_patents
Last Synchronized
2026-11-08 07:35
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/02; F01N1/026; F01N1/04; F01N1/08; F01N1/12; F01N1/125; F01N2490/00; F01N2490/15; F01N2490/155; F01N2490/20
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.