US3695984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel micaceous insulation
Assignee: Westinghouse Electric Corp
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Filing: 1971-01-11
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Granted: 1972-10-03
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Expires: 1991-01-11
Abstract
Abstract A THIN SOLID THERMOPLASTIC BINDER SHEET IS SANDWICHED BETWEEN A SHEET OF MICACEOUS INSULATION AND A FIBROUS SUBSTRATE OR BACKING SHEET SUCH AS POLYESTER FIBER WEBBING OR GLASS FIBER CLOTH. THE COMPOSITE IS HEATED AND PRESSED TOGETHER. THE THERMOPLASTOC BLINDER SHEET SOFTENS AND BONDS THE FIBERS OF THE BACKING TO THE MICA SHEET. THE THERMOPLASTOC SHEET ALSO SHRINKS SO THAT FILM DISCONTINUITIES ARE FORMED IN AREAS BETWEEN THE FIBERS OF THE BACKING. THE RESULTING COMPOSITE INSULATION HAS EXCELLENT PHYSICAL AND ELECTRICAL PROPERTIES AND IS PERMEABLE TO LIQUID INSULATING VARNISHES OR RESINS.
Inventors
- 👤 Dow A Rogers Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:42
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/30; H01B3/00; H01B3/02; H01B3/04; H01B3/18; H01B3/48; H01B3/485; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/25; Y10T428/251; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/29; Y10T428/2911
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |