Self-contained warming pad
US4095583A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1976 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Nov 19, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2007/0276
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A self-contained warming pad characterized by a heating element, an adjacent dose of activating liquid within a frangible container, and a substantially liquid-impervious cover enclosing the element and frangible container and having at least one tortuous air passage therethrough. Features include a cover having thermal insulating qualities, and a frangible container made of a meltable substance having a melting point chosen to control the upper temperatures of the pad. Other features relate to a cover configuration which provides an annular breathing passage, and a porous resilient mass within the pad which provides a substantial breathing capacity. The heating element is preferably an electrochemical element, and most preferably a complex electrochemical element having two cathode layers and one anode layer in a sandwich-like structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.