Patent FR487976A successfully refreshed from Google Patents.
Patent DE43570C successfully refreshed from Google Patents.
DE43570C
Active / In Force
DE
Device on boiler firing systems for supplying preheated combustion air in and behind the combustion chamber
Assignee: TH. LlSHMAN in Newcastle-on-Tyne, 2 Close, England
•
Filing: —
•
Granted: —
•
Expires: —
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-05 11:53
CPC Classifications
F; F23; F23M; F23M9/00; F23M9/02
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.