Patent Number: 4,505,252  Date of Patent: Mar. 19, 1985
 HOLLOW DISHES WITH MELTABLE
CORES AND METHOD OF MAKING SUCH
 Inventors: Takashi Wada; Masaru Wada, both of Tsubame; Toshi Matsu, Tokyo, all of Japan
 Assignee: American Hospital Supply Corporation, Evanston, 111.
 Appl. No.: 530,816
 Filed: Sep. 9, 1983
 Int. CI.3 A47G 23/04
 U.S. CI 126/246; 126/375
 Field of Search 126/375, 246, 400;
220/3.1; 99/447, 483; 206/524.8; 165/185;
219/430, 439; 208/20
 References Cited
U.S. PATENT DOCUMENTS
3,148,676 9/1964 Truog et al 126/375 X
3,557,774 1/1971 Kreis 126/246
4,246,884 1/1981 Vandas 126/375 X
FOREIGN PATENT DOCUMENTS
W079/2563 6/1979 PCT Int'l Appl 126/375
Primary Examiner—Randall L. Green
Attorney, Agent, or Firm—Patrick F. Bright; Donald L.
A hollow dish with a discrete, meltable core such as a wax core includes top and bottom members welded to one another at their periphery, and a meltable, preferably wax core confined within an oxygen-free, waterfree cavity between the top and bottom members. A method for making a hollow dish with such a core includes liquifying a meltable substance such as wax in an oxygen-free, water-free, inert atmosphere; cooling and solidifying the meltable substance to form a meltable core; placing the meltable wax core in the cavity inside a hollow dish; removing all oxygen and water from the core-containing cavity inside the hollow dish; and sealing the hollow dish to preclude escape of the wax core from the cavity and to preclude oxygen and water from entering the cavity.
9 Claims, 9 Drawing Figures