US5138292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated apparatus
Assignee: Herion Werke KG
•
Filing: 1991-03-08
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Granted: 1992-08-11
•
Expires: 2011-03-08
Abstract
Abstract In an electromagnet of a type including a coil and a ferromagnetic circuit which are arranged in a casing of plastic material or metal, the coil and the ferromagnetic circuit are embedded in an inner casting compound for purposes of fixation and electrical insulation, with a permanently elastic outer casting compound being arranged over the inner casting compound.
Inventors
- 👤 Joachim Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:41
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
65 words
Encapsulated apparatus, in particular explosion-proof electromagnet of the type including a coil and a ferromagnetic circuit which are fitted in a casing closable by a lid, comprising: an inner casting compound in which the coil and the ferromagnetic circuit are embedded for fixation and electrical insulation; and a permanently elastic outer casting compound completely covering said inner casting compound along the area facing the lid.
Claim 2
Dependent Claim
65 words
Encapsulated apparatus, in particular explosion-proof electromagnet of the type including a coil and a ferromagnetic circuit which are fitted in a casing closable by a lid, comprising: an inner casting compound in which the coil and the ferromagnetic circuit are embedded for fixation and electrical insulation; and a permanently elastic outer casting compound completely covering said inner casting compound along the area facing the lid.
Claim 3
Dependent Claim
21 words
Apparatus as defined in claim 1 wherein said outer casting compound has a width ranging from about 4 to 6 mm.
Claim 4
Dependent Claim
18 words
Apparatus as defined in claim 2 wherein said outer casting compound has a width of about 5 mm.
Claim 5
Dependent Claim
23 words
Apparatus as defined in claim 1 wherein said inner casting compound is an epoxy resin and said outer casting is a silicone rubber.
Claim 6
Dependent Claim
16 words
Apparatus as defined in claim 1 wherein said inner and outer casting compounds contain mineral fillers.
Claim 7
Dependent Claim
13 words
Apparatus as defined in claim 5 wherein said mineral fillers include stone dust.
Claim 8
Dependent Claim
12 words
Apparatus as defined in claim 5 wherein said mineral fillers include quartz.
Claim 9
Dependent Claim
14 words
Apparatus as defined in claim 1 wherein said casing is made of plastic material.
Claim 10
Dependent Claim
13 words
Apparatus as defined in claim 1 wherein said casing is made of metal.
Claim 11
Dependent Claim
61 words
An electromagnet, comprising: a casing; a lid adapted for closure of said casing; a coil and a ferromagnetic circuit arranged in said casing; an internal casting compound in which the coil and the ferromagnetic circuit are embedded for fixation and electrical insulation; and a permanently elastic outer casting compound completely covering said inner casting compound along the area facing the lid.
Claim 12
Dependent Claim
61 words
An electromagnet, comprising: a casing; a lid adapted for closure of said casing; a coil and a ferromagnetic circuit arranged in said casing; an internal casting compound in which the coil and the ferromagnetic circuit are embedded for fixation and electrical insulation; and a permanently elastic outer casting compound completely covering said inner casting compound along the area facing the lid.
Claim 13
Dependent Claim
70 words
Encapsulated apparatus, in particular explosion-proof electromagnet of the type including a coil and a ferromagnetic circuit which are fitted in a casing, comprising: an inner casting compound in which the coil and the ferromagnetic circuit are embedded for fixation and electrical insulation; and a permanently elastic outer casting compound arranged over said inner casting compound wherein said outer casting compound has a width ranging from about 4 to 6 mm.
Claim 14
Dependent Claim
70 words
Encapsulated apparatus, in particular explosion-proof electromagnet of the type including a coil and a ferromagnetic circuit which are fitted in a casing, comprising: an inner casting compound in which the coil and the ferromagnetic circuit are embedded for fixation and electrical insulation; and a permanently elastic outer casting compound arranged over said inner casting compound wherein said outer casting compound has a width ranging from about 4 to 6 mm.
Claim 15
Dependent Claim
18 words
Apparatus as defined in claim 11 wherein said outer casting compound has a width of about 5 mm.
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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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |