US4486482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum heat insulator
Assignee: Hitachi Ltd
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Filing: 1983-06-15
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Granted: 1984-12-04
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Expires: 2003-06-15
Abstract
Abstract A vacuum heat insulator comprises compressed glass fibers, a planar thin metal plate and a drawn metal plate. A receptacle is air-tightly formed of the planar thin plate and the drawn metal plate. The glass fibers are encased in the receptacle under a vacuum condition. A small amount of the glass fibers is penetrated thereinto in a direction perpendicular to the heat transfer direction of the insulator by inserting needles having hook portions into the glass fibers whereby the compressed glass fibers are kept under a vacuum condition at a high density without any remarkable deformation.
Inventors
- 👤 Nobuyuki Kobayashi
- 👤 Yoritsune Abe
- 👤 Katuo Shibata
- 👤 Yukio Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:09
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/06; F16L59/065; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; E04B1/78; E04B1/80; E04B1/803; Y; Y02; Y02A; Y02A30/00; Y02A30/24; Y02A30/242; Y02B; Y02B80/00; Y02B80/10; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/23; Y10T428/231; Y10T428/237; Y10T428/238; Y10T428/239; Y10T428/24; Y10T428/24942; Y10T428/2495
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A vacuum heat insulator comprising a receptacle defined by thin metal plates each having a flat portion providing opposing walls of the receptacle and a stack of glass fibers contained in said receptacle, the majority of the fibers of said stack being arranged at random in a direction parallel to said walls and perpendicular to a heat transfer direction and said receptacle being adapted to be sealed to place the interior thereof in a vacuum condition; some of the glass fibers of said glass fiber stack having been penetrated thereinto as penetration glass fibers that extend in said heat transfer direction while said glass fiber stack is maintained in a compressed condition to provide a glass fiber stack of high density held together by said penetration glass fibers whereby, upon application of the vacuum condition to said receptacle, the opposing walls are deformed inwardly and are supported by said glass fiber stack.
Claim 2
Dependent Claim
152 words
A vacuum heat insulator comprising a receptacle defined by thin metal plates each having a flat portion providing opposing walls of the receptacle and a stack of glass fibers contained in said receptacle, the majority of the fibers of said stack being arranged at random in a direction parallel to said walls and perpendicular to a heat transfer direction and said receptacle being adapted to be sealed to place the interior thereof in a vacuum condition; some of the glass fibers of said glass fiber stack having been penetrated thereinto as penetration glass fibers that extend in said heat transfer direction while said glass fiber stack is maintained in a compressed condition to provide a glass fiber stack of high density held together by said penetration glass fibers whereby, upon application of the vacuum condition to said receptacle, the opposing walls are deformed inwardly and are supported by said glass fiber stack.
Claim 3
Dependent Claim
37 words
A vacuum heat insulator according to claim 1, wherein said penetration glass fibers penetrate into said stack of glass fibers from opposite sides to provide loops of the penetration fibers on the opposite sides of said stack.
Claim 4
Dependent Claim
45 words
A vacuum heat insulator according to claim 1, wherein said receptacle is defined by a drawn thin metal plate and a planar sheet metal plate, and wherein a thickness of said planar sheet metal plate is smaller than that of said drawn thin metal plate.
Claim 5
Dependent Claim
38 words
A vacuum heat insulator according to claim 1, wherein said metal plates are made of an alloy selected from the group consisting of iron mixed with nickel, iron mixed with chrome, and iron mixed with nickel and chrome.
Claim 6
Dependent Claim
21 words
A vacuum heat insulator according to claim 1, wherein said glass fibers do not contain additives including hardening agent and adhesives.
Claim 7
Dependent Claim
25 words
A vacuum heat insulator according to claim 1, wherein said glass fibers are, prior to being placed in said stack, cut into a predetermined length.
Claim 8
Dependent Claim
24 words
A vacuum heat insulator according to claim 1, wherein said vacuum heat insulator further comprising a getter for absorbing gas disposed within said receptacle.
References Cited (Backward Citations)
US3179549A
Cited
US3387767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |