US5547599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite/epoxy film
Assignee: Raytheon Co
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Filing: 1989-03-17
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Granted: 1996-08-20
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Expires: 2009-03-17
Abstract
Abstract A composition of ferrite and epoxy having the form of a film which can be cut, pressed onto word straps, and heat-cured to form an encapsulating keeper on a plated wire memory. The film comprises ferrite powder in a mixture of epoxy resins, typically Epon 1009 and Epon 828, pulverized dicyandiamide and butadiene/acrylonitrile rubber. The mixture is sprayed onto a sheet of halogenated polyolefin and air dried for 8-12 hours at between 160° F. and 180° F. The resulting flexible film is die cut to fit over word straps and further processed by applying 50-75 psi at 325° F. for one hour.
Inventors
- 👤 Austin A. Wolfrey
- 👤 Samuel L. Bagdasarian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:09
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; H01F1/113; C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/226; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021; C08L; C08L63/00; G; G11; G11C; G11C11/00; G11C11/02; G11C11/14; G11C11/155; H01F1/0027; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31529
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
A composition comprising: first and second reactive epoxy resins having equivalent weights between approximately 140 and 3000, both epoxy resins having oxirane attached to methylene bridges, both epoxy resins being B-stageable; a curing agent comprising dicyandiamide; a thermoplastic reactive rubber; and ferrite powder.
Claim 2
Dependent Claim
43 words
A composition comprising: first and second reactive epoxy resins having equivalent weights between approximately 140 and 3000, both epoxy resins having oxirane attached to methylene bridges, both epoxy resins being B-stageable; a curing agent comprising dicyandiamide; a thermoplastic reactive rubber; and ferrite powder.
Claim 3
Dependent Claim
55 words
(Amended) The composition according to claim 1 wherein said first epoxy resin comprises a solid at room temperature and said second epoxy resin comprises a liquid at room temperature, and wherein said first and second epoxy resins are combined in a proportion such that said combination is deformable under pressure when said combination is B-staged.
Claim 4
Dependent Claim
16 words
The composition according to claim 1 wherein said reactive rubber comprises hydroxyl terminated butadiene acrylonitrile rubber.
Claim 5
Dependent Claim
19 words
The composition according to claim 1 wherein said ferrite powder comprises approximately 85 percent of the composition by weight.
Claim 6
Dependent Claim
18 words
The composition according to claim 1 wherein said ferrite powder has a maximum fineness of approximately 400 mesh.
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) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |