Patent FR662879A successfully refreshed from Google Patents.
FR662879A
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Bifocal optical glass and method of manufacturing this glass
Assignee: EMIL BUSCH AG
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Filing: 1928-10-24
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Granted: 1929-08-13
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Expires: 1948-10-24
Abstract
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Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-07 19:50
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03B23/0252; C03B23/20; C03B23/22
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