Patent DE500658C successfully refreshed from Google Patents.
DE500658C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Process for the production of ink-proof and ink-proof blueprints as well as copies without the effect of light
Assignee: DUERENER FABRIK PRAEPARIERTER
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Filing: 1929-08-27
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Granted: 1930-06-24
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Expires: 1949-08-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-10-29 04:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61
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