US4529638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal insulator
Assignee: Panasonic Holdings Corp
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Filing: 1981-12-03
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Granted: 1985-07-16
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Expires: 2001-12-03
Abstract
Abstract A thermal insulator comprises an expanded resin body having embedded therein an evacuated powder insulation portion which consists of fine powder and a container of film-like plastics or a film-like composite of plastics and metal for enclosing the powder. The resin body has been expanded by a Freon gas as a blowing agent. Since a Freon gas has a larger molecular diameter than the constituent gases of air, it is less likely to permeate through the container than air. Thus present invention provides a novel composite insulator which fully utilizes the benefits of vacuum insulation without necessitating a strong and costly material for a vacuum container.
Inventors
- 👤 Ryoichi Yamamoto
- 👤 Yoshihiro Matsuo
- 👤 Masanari Mikoda
- 👤 Yoshihiro Asada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:28
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/16; B32B15/00; B32B15/04; B32B15/046; B32B27/00; B32B27/14; B32B5/18; B32B9/00; B32B9/002; B32B9/04; B32B9/045; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; E04B1/78; E04B1/80; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2305/00; B32B2305/02; B32B2305/022; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2311/00; B32B2318/00; B32B2318/04; B32B2375/00; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/231; Y10T428/233; Y10T428/23907; Y10T428/23914; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249981
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
32 words
A thermal insulator comprising an expanded resin body having embedded therein at least one evacuated powder insulation portion, said insulation portion comprising fine powder and a film-like flexible container enclosing said powder.
Claim 2
Dependent Claim
32 words
A thermal insulator comprising an expanded resin body having embedded therein at least one evacuated powder insulation portion, said insulation portion comprising fine powder and a film-like flexible container enclosing said powder.
Claim 3
Dependent Claim
23 words
A thermal insulator as defined in claim 1 wherein said container is made of film-like plastics or film-like composite of plastics and metal.
Claim 4
Dependent Claim
24 words
A thermal insulator as defined in claim 1 wherein said resin body is made of a polyurethane expanded by at least one Freon gas.
Claim 5
Dependent Claim
20 words
A thermal insulator as defined in claim 1 wherein said insulation portion is provided in the form of a layer.
Claim 6
Dependent Claim
34 words
A thermal insulator as defined in claim 1 wherein said powder comprises fine powder of an inorganic substance or plastics, the grains of the powder being in the form of a hollow spherical body.
Claim 7
Dependent Claim
24 words
A thermal insulator as defined in claim 1 wherein said resin body has been expanded by trichlorofluoromethane or a mixture of trichlorofluoromethane and dichlorodifluoromethane.
References Cited (Backward Citations)
US3264165A
Cited
US3769770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |