Patent ID: 7435695

Claim:
A glass composition consisting of, in terms of mole percent of the total composition, a. 40-65% P 2 O 5 ; b. 0.1-15% Nb 2 O 5 ; c. 25-37% of ZnO; d. 0-6% Al 2 O 3 ; e. 0-10% Bi 2 O 3 ; f. 0-5% B 2 O 3 g. total of 0-5% of Ta 2 O 5 , V 2 O 5 , Sb 2 O 3 , ZrO 2 , and/or TiO 2 ; h. 0-3% alkali oxides; i. 0-5% alkali fluorides; and j. total of 0-5% oxides of Mg, Ca, Sr, Ba, Cu, Fe, and/or Mn.