Patent 4984316 Issued on January 15, 1991. Estimated Expiration Date: December 19, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
The present invention relates to a generally flat bed warmer which is formed from a flexible, non-porous material. The bed warmer is inserted beneath or between the sheets of a bed for heating up the same. An inlet is defined in the flexible, impervious envelope so that the envelope can be coupled to and inflated by a source of hot air. The heat from the hot air in the bed warmer is transferred to the bed linens through the wall of the envelope. Furthermore, a plurality of apertures are defined through at least one wall of the bed warmer so as to allow controlled leakage of hot air from the bed warmer.