Patent US4009459A successfully refreshed from Google Patents.
US4009459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin-empotted dry-type electromagnet for dusty and gassey locations
Assignee: Individual
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Filing: 1975-05-05
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Granted: 1977-02-22
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Expires: 1995-05-05
Abstract
Abstract An electromagnet is disclosed. The electromagnet has a winding that is wet wound with an epoxy material filled with grains of a material having a high coefficient of thermal-conductivity. The entire winding is empotted dry in a similar epoxy having grains of the said material. Fins are connected to the outside of the dry empotment for carrying away heat transferred to the fins from the coil.
Inventors
- 👤 William H. Benson
- 👤 Gerald D. Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:50
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; H01F7/206; H01F27/00; H01F27/08; H01F27/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
An electromagnet comprising, a back plate, a circular bottom plate and a wear plate supporting said bottom plate, a shell disposed between said back plate and said wear plate and fixed to said back plate, heat dissipation fins disposed between said back plate and said wear plate and adjacent said shell and extending radially outwardly from said shell, a winding disposed in said shell adjacent said back plate, said winding and said shell defining a space therebetween, said space being filled with an epoxy material that is filled with grains of material having a high coefficient of thermalconductivity.
Claim 2
Dependent Claim
98 words
An electromagnet comprising, a back plate, a circular bottom plate and a wear plate supporting said bottom plate, a shell disposed between said back plate and said wear plate and fixed to said back plate, heat dissipation fins disposed between said back plate and said wear plate and adjacent said shell and extending radially outwardly from said shell, a winding disposed in said shell adjacent said back plate, said winding and said shell defining a space therebetween, said space being filled with an epoxy material that is filled with grains of material having a high coefficient of thermalconductivity.
Claim 3
Dependent Claim
44 words
The electromagnet recited in claim 1 wherein said epoxy material is filled with tabular grains of material in the form of platelets of 325 grit size and about half the said grains being of a large size, some of said grains overlapping each other.
Claim 4
Dependent Claim
30 words
The electromagnet recited in claim 2 wherein said winding is wet wound around said core with said epoxy material, said wet winding then being heat cured to a dry state.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |