US5141972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating material and production thereof
Assignee: Junkosha Co Ltd
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Filing: 1991-04-29
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Granted: 1992-08-25
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Expires: 2011-04-29
Abstract
Abstract An insulation material made of rigid microballons within the pores of a porous polymeric base material.
Inventors
- 👤 Yoshiaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:32
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373; B; B29; B29C; B29C70/00; B29C70/58; B29C70/66; C; C08; C08J; C08J9/00; C08J9/32; C08J9/36; C08J9/40; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/443; H01B3/445; B29K; B29K2105/00; B29K2105/06; B29K2105/16; B29K2105/165; H05K1/032; H05K1/034; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0116; H05K2201/0137; H05K2201/015; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/0242; H05K2201/0254
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A process for producing an insulating material which comprises dipping a low dielectric open-celled porous polytetrafluoroethylene (PTFE) in an ultrasonically stirred liquid in which are dispersed a number of low dielectric hard glass or silica microspheres containing an inert gas, thereby causing the low dielectric open-celled porous polytetrafluoroethylene, and subsequently heating the system, thereby causing the low dielectric porous polytetrafluoroethylene shrink slightly so that the low dielectric hard microspheres are fixed in the pores.
Claim 2
Dependent Claim
74 words
A process for producing an insulating material which comprises dipping a low dielectric open-celled porous polytetrafluoroethylene (PTFE) in an ultrasonically stirred liquid in which are dispersed a number of low dielectric hard glass or silica microspheres containing an inert gas, thereby causing the low dielectric open-celled porous polytetrafluoroethylene, and subsequently heating the system, thereby causing the low dielectric porous polytetrafluoroethylene shrink slightly so that the low dielectric hard microspheres are fixed in the pores.
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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |