US3943333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open coil electric heating elements
Assignee: Individual
•
Filing: 1974-08-23
•
Granted: 1976-03-09
•
Expires: 1994-08-23
Abstract
Abstract Our invention relates to open coil electric heating elements of conventional construction but treated to resist corrosion and to electrically insulate exposed metallic surfaces. In accordance with the invention, the component parts of the heater, except the coiled resistance wire and in some cases the supporting insulating bushings, are assembled and then coated with a silicone resin-based coating composition. The composition is applied in a flowable state to cover all exposed surfaces and fill all cracks and crevices to thereby prevent accumulation of moisture thereat.
Inventors
- 👤 Leonard D. Kokjohn
- 👤 Wayne R. Seeley
- 👤 Charles A. Brown
- 👤 Reynold C. King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:01
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
122 words
An open coil electric heating element, comprising: a metal frame support formed of a plurality of metal members which are rigidly connected together, a plurality of insulator bushings carried by said frame support in predetermined spaced manner, a coiled bare resistance wire strung through said insulator bushings and adapted to be connected to a source of electricity to produce heat, and a coating of silicone resin-based coating composition on said frame support, said coating being applied in flowable form to cover all exposed surfaces of said frame support, the coating drying to a rigid state to provide corrosion-resistance and electrical-insulating properties to said metal frame support, said coating filling all cracks and crevises of and between the parts comprising said frame support.
Claim 2
Dependent Claim
122 words
An open coil electric heating element, comprising: a metal frame support formed of a plurality of metal members which are rigidly connected together, a plurality of insulator bushings carried by said frame support in predetermined spaced manner, a coiled bare resistance wire strung through said insulator bushings and adapted to be connected to a source of electricity to produce heat, and a coating of silicone resin-based coating composition on said frame support, said coating being applied in flowable form to cover all exposed surfaces of said frame support, the coating drying to a rigid state to provide corrosion-resistance and electrical-insulating properties to said metal frame support, said coating filling all cracks and crevises of and between the parts comprising said frame support.
Claim 3
Dependent Claim
14 words
The construction according to claim 1 wherein said coating also covers said insulator bushings.
References Cited (Backward Citations)
US948819A
Cited
US2397568A
Cited
US2457598A
Cited
US2628300A
Cited
US2665357A
Cited
US2921172A
Cited
US3205467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |