Hollow dishes with meltable cores and method of making such dishes
US4505252A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1983 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Sep 9, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47J36/2494
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
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, water-free 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.