US4292505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for generating heat by electrical resistance
Assignee: Individual
•
Filing: 1979-09-19
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Granted: 1981-09-29
•
Expires: 1999-09-19
Abstract
Abstract A furnace having a body in which electrically resistive material is positioned between two electrodes so that heat can be generated by passing a current through the material. The resistive material is a mixture of carbonized plant material and a non-organic material that acts as a insulator at low temperatures and acts as a conductor or semi-conductor at high temperatures.
Inventors
- 👤 Jeoung K. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:30
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A controlled electrically resistant heat generating furnace comprising: a furnace body; a plurality of electrodes secured in and to oppose each other within said furnace body; a plurality of heat generating elements disposed between said electrodes; and constant power control circuit means for supplying an electric current across said electrodes; said heat generating elements comprising a substantially homogencous mixture of carbonized plant particles, non-organic particles and a carbonized binder, the amount by weight of said carbonized plant particles in said mixture being greater than the amount by weight of said non-organic particles, and said non-organic particles being electrical insulators below a predetermined temperature and being conductors or semiconductors above said predetermined temperature.
Claim 2
Dependent Claim
112 words
A controlled electrically resistant heat generating furnace comprising: a furnace body; a plurality of electrodes secured in and to oppose each other within said furnace body; a plurality of heat generating elements disposed between said electrodes; and constant power control circuit means for supplying an electric current across said electrodes; said heat generating elements comprising a substantially homogencous mixture of carbonized plant particles, non-organic particles and a carbonized binder, the amount by weight of said carbonized plant particles in said mixture being greater than the amount by weight of said non-organic particles, and said non-organic particles being electrical insulators below a predetermined temperature and being conductors or semiconductors above said predetermined temperature.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |