| US 7,384,581 B2 | ||
| Forming transparent crystalline elements by cold working | ||
| Abraham Katzir, Him 15, Afeka, Tel Aviv 69696 (Israel) | ||
| Assigned to Abraham Katzir, Tel-Aviv (Israel) | ||
| Filed on Jun. 09, 2003, as Appl. No. 10/456,631. | ||
| Application 10/456631 is a continuation in part of application No. 10/138581, filed on May 06, 2002, abandoned. | ||
| Application 10/138581 is a continuation of application No. 09/458688, filed on Dec. 10, 1999, abandoned. | ||
| Claims priority of provisional application 60/111929, filed on Dec. 11, 1998. | ||
| Prior Publication US 2003/0222380 A1, Dec. 04, 2003 | ||
| Int. Cl. B28B 5/00 (2006.01); G02B 1/00 (2006.01) | ||
| U.S. Cl. 264—1.21 [264/1.23] | 8 Claims |
| 1. A method of forming an optical element, the method comprising the steps of:
(a) providing an ingot of at least one silver halide selected from the group consisting of silver chloride, silver bromide,
silver iodide, silver chloro-bromide, silver bromo-iodide, silver chloro-iodide, and silver chlorobromo-iodide and including
at most about one part per million of metallic impurities, by steps including:
(i) mixing silver nitrate with at least one acid selected from the group consisting of hydrochloric acid, hydrobromic acid
and hydroiodic acid, to precipitate said at least one silver halide as at least one powder;
(ii) melting said at least one powder to provide a melt, and
(iii) cooling said melt to form said ingot; and
(e) pressing said ingot between an upper die and a lower die while said ingot is confined laterally by a split die.
|