EP 0016885 A1 19801015 - Cut gemstone, method and apparatus for producing it.
Title (en)
Cut gemstone, method and apparatus for producing it.
Title (de)
Geschliffener Edelstein, Verfahren und Vorrichtung zu seiner Herstellung.
Title (fr)
Pierre précieuse taillée, procédé et machine pour sa fabrication.
Publication
Application
Priority
AU PD702578 A 19781206
Abstract (en)
Gemstones are cut such that the pavillion facets are curved facets (12, 14, 16) and are arranged in pairs around the pavillion and so disposed relative to each other and the crown and table of the gemstone that light entering the stone through the crown and meeting the first curved facet of a pair is converged and reflected on to a second curved facet of that pair from which it is reflected to the crown, faceting machine for producing such facets is disclosed.
IPC 1-7
IPC 8 full level
A44C 17/00 (2006.01); B24B 9/16 (2006.01)
CPC (source: EP)
A44C 17/001 (2013.01); B24B 9/16 (2013.01)
Citation (search report)
- FR 359826 A 19060405 - ERNEST GEORGE HENRY SCHENCK [US]
- FR 772941 A 19341108
- FR 786692 A 19350907 - BAYARDI BROTHERS, et al
- US 4083352 A 19780411 - ANDRYCHUK DMETRO
- GB 1094140 A 19671206 - HARRY HUISMAN, et al
- FR 2296503 A1 19760730 - TOYE GEMSTONES LTD [GB]
- US 3811229 A 19740521 - MONTGOMERY E
- FR 555761 A 19230706
- US 3135073 A 19640602 - ODLE HAROLD L
- FR 320438 A 19021210 - GREGORY GEORGE WILLIAM [FR]
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0016885 A1 19801015; IL 58834 A0 19800229; IL 58834 A 19821231; JP S55101361 A 19800802
DOCDB simple family (application)
EP 79302801 A 19791205; IL 5883479 A 19791130; JP 15692179 A 19791205