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Patent US4492725A successfully refreshed from Google Patents.
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US4492725A Expired / Lapsed US ⏱️ 0.0 years remaining

Composite thermal insulator

Assignee: Panasonic Holdings Corp
•
Filing: 1983-07-18
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Granted: 1985-01-08
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Expires: 2003-07-18
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Abstract

Abstract The disclosure is directed to a composite thermal insulator including a Freon gas expanded plastic, and an evacuated powder insulation. The present invention provides a composite thermal insulator light in weight and having a superior heat insulating performance over a long period through replacement of a thick metallic container conventionally used for the evacuated powder insulation and considered indispensable for withstanding a load at one atmospheric pressure and for preventing vacuum leakage, by a film-like plastic container, with activated carbon disposed in it. More specifically, the composite thermal insulator of the present invention includes a Freon gas expanded plastic, a film-like plastic container evacuated to form a vacuum in its interior, and directly contacting and/or covered by the expanded plastic, and activated carbon or inorganic powder containing activated carbon tightly enclosed in the plastic container, light in weight, having a heat conductivity lower than 0.01 kcal/mh DEG C. and a mechanical strength sufficient for actual use, with almost no variations with time in the heat insulating property.

Inventors

  • 👤 Shoichi Ishihara
  • 👤 Hiroshi Yoneno
  • 👤 Ryoichi Yamamoto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 19:52
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/02; B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5609; F16L59/06; F17; F17C; F17C13/00; F17C13/001; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/231; Y10T428/239; Y10T428/25; Y10T428/29; Y10T428/2982; Y10T428/2991

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 39 words
A composite thermal insulator which comprises an expanded plastic, a film-like plastic container evacuated to form a vacuum in its interior and partly or entirely covered by said expanded plastic, and activated carbon tightly enclosed within said plastic container.
Claim 2
Dependent Claim 39 words
A composite thermal insulator which comprises an expanded plastic, a film-like plastic container evacuated to form a vacuum in its interior and partly or entirely covered by said expanded plastic, and activated carbon tightly enclosed within said plastic container.
Claim 3
Dependent Claim 18 words
A composite thermal insulator as claimed in claim 1, wherein said expanded plastic is expanded by Freon gas.
Claim 4
Dependent Claim 22 words
A composite thermal insulator as claimed in claim 1, wherein said activated carbon has an average particle diameter smaller than 0.15 mm.
Claim 5
Dependent Claim 20 words
A composite thermal insulator as claimed in claim 1, wherein said activated carbon is activated by a steam activation process.
Claim 6
Dependent Claim 55 words
A composite thermal insulator which comprises a Freon gas expanded plastic, a film-like plastic container evacuated to form a vacuum in its interior and partly or entirely covered by said expanded plastic, and inorganic powder containing activated carbon sufficient in amount at least to adsorb Freon gas thereto and tightly enclosed within said plastic container.
Claim 7
Dependent Claim 55 words
A composite thermal insulator which comprises a Freon gas expanded plastic, a film-like plastic container evacuated to form a vacuum in its interior and partly or entirely covered by said expanded plastic, and inorganic powder containing activated carbon sufficient in amount at least to adsorb Freon gas thereto and tightly enclosed within said plastic container.
Claim 8
Dependent Claim 21 words
A composite thermal insulator as claimed in claim 5, wherein said activated carbon is one activated by a steam activation process.
Claim 9
Dependent Claim 32 words
A composite thermal insulator as claimed in claim 5, wherein said activated carbon is present at a boundary portion between said film-like plastic container and inorganic powder other than the activated carbon.
Claim 10
Dependent Claim 22 words
A composite thermal insulator as claimed in claim 5, wherein said activated carbon is packed in a container having a gas permeability.

References Cited (Backward Citations)

US3264165A Cited
US3850714A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-01-08 1988-07-09 1989-01-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-01-08 1992-07-09 1993-01-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-01-08 1996-07-09 1997-01-08 $7700.00 Window Closed / Lapsed

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