Process and apparatus for making homogeneous gas-free optical glass

• US 3,244,493 A
• Filed: 05/09/1951
• Issued: 04/05/1966
• Est. Priority Date: 05/09/1951
• Status: Expired due to Term

• Current Assignee: Charles F. Cala
• Original Assignee: Charles F. Cala
• Inventors: Cala, Charles F.
• Application Number:
  US03/225,331
• Time in Patent Office: 5,445 Days
• US Class Current: 65/134.9
• CPC Class Codes: C03B 5/18 Stirring devices; Homogenisation mixing in general B01F
• CPC Class Codes: Y02P 40/57 Improving the yield, e-g- reduction of reject rates

Claims

1. THE PROCESS OF PREPARING A HOMOGENOUS PLATE OR LENS OF GLASS FOR OPTICAL PURPOSES WHICH CONSISTS IN LEADING SUCCESSIVE GLASS MELTS FROM A MELTING FURNACE THROUGH AN EXTENDED REFINING PASSAGEWAY WITH ATTENUATED SUPERFICIAL AREA AT APPROXIMATELY FURNACE TEMPERATURE FOR DEGASIFICATION, CONTINUOUSLY DRAWING OFF THE MELTS FROM THE PASSAGEWAY, STIRRING EACH MELT AND CONVEYING IT INTO AN ACCUMULATING RESERVOIR HAVING A TEMPERATURE LOWER THAN THE MELTING FURNACE, COLLECTING THE SUCCESSIVE MELTS IN THE RESERVOIR, STIRRING THE MELTS SO CLLECTED UNTIL THE MASS IS HOMOGENOUS AND DRAINING THE ENTIRE MASS INTO A MOLD AS A UNITARY BATCH.

8. APPARATUS FOR PREPARING GLASS FOR OPTICAL PURPOSES WHICH COMPRISES A MELTING FURNACE, A REFINING FURNACE HAVING AN EXTENDED PASSAGEWAY WITH ATTENUATED SUPERFICIAL AREA, A DISCHARGE DUCT FROM THE MELTING FURNACE TO THE REFINING FURNACE, A RESERVOIR, A DUCT FROM THE THE REFINING FURNACE TO THE RESERVOIR, A STIRRER IN SAID LAST MENTIONED DUCT, A STIRRER IN THE RESERVOIR, A CASTING DISCHARGE DUCT FROM THE RESERVOIR AND A STIRRER IN SAID LAST MENTIONED DISCHARGE DUCT.