Rare earth-containing zinc phosphate glasses
Patent 4996172 Issued on February 26, 1991. Estimated Expiration Date: 
June 29, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 29, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPhosphate glass for laser use Laser phosphate glass compositions Optical glass Patent #: 4439530 InventorsAssigneeApplicationNo. 372764 filed on 06/29/1989US Classes:501/45, Phosphorus containing501/48And aluminum or berylliumExaminersPrimary: Bell, Mark L.Attorney, Agent or FirmInternational ClassesC03C 003/16C03C 003/17 AbstractThis invention is concerned with the preparation of glasses exhibiting transition temperatures below 450° C., working temperatures below 500° C., and exceptional resistance to mild aqueous alkaline solutions consisting essentially, expressed in terms of mold percent on the oxide basis, of: ______________________________________ ZnO 12-55 K2 O 0-25 P2 O5 28-40 Li2 O + Na2 O + K2 O 10-35 Li2 O 0-25 Rare earth metal oxide 1-5 Na2 O 0-25 ______________________________________At least two alkali metal oxides will most desirably be present. | |
