DE688227C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Made of translucent and fireproof film, e.g. B. from cellulose hydrate film, made face mask
Assignee: RUDOLF OTTO DR MED
•
Filing: 1938-09-25
•
Granted: 1940-02-15
•
Expires: 1958-09-25
Abstract
No abstract record available.
Inventors
- 👤 Dr Med Rudolf Otto
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-06 02:41
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/02; A61F9/029; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1161; A41D13/1184
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.