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US4595616A Expired / Lapsed US ⏱️ 0.0 years remaining

Encapsulated inductive devices with polybutadiene encapsulant

Assignee: General Electric Co
•
Filing: 1984-10-19
•
Granted: 1986-06-17
•
Expires: 2004-10-19
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Abstract

Abstract Improved encapsulating compositions for inductive devices are provided. The composition has a polybutadiene base and contains an initiator, an inhibitor and a co-agent for improving the curing of the composition under the influence of the initiator. Certain compositions are usable at higher temperatures than prior polybutadiene base encapsulating compounds based on a conditioning of the composition during cure at or near the projected use temperature. When combined with high temperature conductor insulation coatings, such as polyimides, a high temperature encapsulating system is achieved. Certain compositions are usable to provide a soft cure encapsulation from which an encapsulated inductive device may be liberated without damage to the device. For such compositions, soft curable polybutadienes are employed and particularly those having high trans and cis components.

Inventors

  • 👤 Gordon M. Bell
  • 👤 James R. Ridlen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 19:32
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; C; C08; C08L; C08L9/00; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/31504; Y10T428/31855; Y10T428/31931

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 97 words
As an article of manufacture, an inductive device, said device being encapsulated in a cured encapsulant composition, said encapsulant composition prior to its being cured comprising: (a) elastomeric polybutadiene of 100 parts consisting of about 54 to about 66 weight percent trans-1,4 polybutadiene, about 16 to about 24 weight percent cis-1,4 polybutadiene, and about 16 to about 24 weight percent vinyl-1,2-polybutadiene; (b) vinyl toluene of 0 to 40 parts; (c) trimethylol propane trimethacrylate of 0 to 10 parts; (d) peroxide crosslinking agent of 2.5 to 5 parts; (e) inhibitor of not substantially in excess of 0.9 parts.
Claim 2
Dependent Claim 97 words
As an article of manufacture, an inductive device, said device being encapsulated in a cured encapsulant composition, said encapsulant composition prior to its being cured comprising: (a) elastomeric polybutadiene of 100 parts consisting of about 54 to about 66 weight percent trans-1,4 polybutadiene, about 16 to about 24 weight percent cis-1,4 polybutadiene, and about 16 to about 24 weight percent vinyl-1,2-polybutadiene; (b) vinyl toluene of 0 to 40 parts; (c) trimethylol propane trimethacrylate of 0 to 10 parts; (d) peroxide crosslinking agent of 2.5 to 5 parts; (e) inhibitor of not substantially in excess of 0.9 parts.
Claim 3
Dependent Claim 25 words
The article of claim 1 in which the cured encapsulant is soft enough to permit the inductive device to be liberated without significant damage thereto.
Claim 4
Dependent Claim 20 words
The article of claim 1 in which the encapsulant has been cured at a temperature proximate the end use temperature.
Claim 5
Dependent Claim 22 words
The article of claim 1 or 3 in which the article is rated for a high temperature operating capability of 220° C.
Claim 6
Dependent Claim 38 words
The article of claims 1, 2 or 3 in which the range of vinyl toluene and trimethylol propane trimethacrylate is as follows: ______________________________________ INGREDIENT PARTS ______________________________________ vinyl toluene 17 to 25 trimethylol propane 4 to 8 trimethacrylate ______________________________________

References Cited (Backward Citations)

US3488616A Cited
US3751378A Cited
US3970723A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-06-16 1989-12-16 1990-06-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-06-16 1993-12-16 1994-06-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-06-16 1997-12-16 1998-06-17 $7700.00 Window Closed / Lapsed

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