US3856172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuumized plastic cap for heat insulating containers
Assignee: Dow Chemical Co
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Filing: 1973-08-20
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Granted: 1974-12-24
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Expires: 1993-08-20
Abstract
Abstract Heat insulative properties of vacuum containers such as vacuum bottles are significantly improved by stoppering the container with a vacuumized plastic cap having a boundary wall of structural plastic material wherein the inner surface of the boundary wall is coated with a thin metallic layer and a layer of barrier plastic such as a vinylidene chloride copolymer and which encloses an evacuated space filled with a gas absorbing material such as activated charcoal.
Inventors
- 👤 W Walles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:40
CPC Classifications
B; B32; B32B; B32B1/00; A; A47; A47J; A47J41/00; A47J41/02; A47J41/022; B32B15/00; B32B15/04; B32B15/08; B32B15/082; B32B15/085; B32B15/088; B32B15/09; B32B15/098; B32B15/20; B32B27/00; B32B27/28; B32B27/285; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B32B27/36; B32B27/42; B65; B65D; B65D11/00; B65D11/16; B65D81/00; B65D81/38; B65D81/3837; B65D81/3846; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; E04B1/78; E04B1/80; F; F17; F17C; F17C3/00; F17C3/02; F17C3/08; B32B2311/00; B32B2311/02; B32B2311/04; B32B2311/08; B32B2311/12; B32B2311/14; B32B2311/16; B32B2311/18; B32B2311/22; B32B2311/24; B32B2323/00; B32B2361/00; B32B2367/00; B32B2369/00; B32B2371/00; B32B2377/00; B32B2439/00; B32B2439/40; B32B2439/60; C; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1633; C23C18/1646; C25; C25D; C25D5/00; C25D5/54; C25D5/56; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2203/00; F17C2203/03; F17C2203/0391; F17C2203/0395; F17C2203/06; F17C2203/0602; F17C2203/0607; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2203/0634; F17C2203/0636; F17C2203/0658; F17C2203/066; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0311; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
38 words
A VACUUM PLASTIC CAP COMPRISING ENCAPSULATING BOUNDARY WALL OF A NORMALLY SOLID PLASTIC MATERIAL COMPLETELY ENCLOSING AN EVACUATED SPACE, A LAYER OF METAL ON AT LEAST ONE ENTIRE SURFACE OF SAID BOUNDARY WALL, AN OVERCOATING OF A BARRIER
Claim 2
Dependent Claim
38 words
A VACUUM PLASTIC CAP COMPRISING ENCAPSULATING BOUNDARY WALL OF A NORMALLY SOLID PLASTIC MATERIAL COMPLETELY ENCLOSING AN EVACUATED SPACE, A LAYER OF METAL ON AT LEAST ONE ENTIRE SURFACE OF SAID BOUNDARY WALL, AN OVERCOATING OF A BARRIER
Claim 3
Dependent Claim
26 words
The plastic cap of claim 1 wherein the metal layer is on the surface of the boundary wall which is most proximate to the enclosed space.
Claim 4
Dependent Claim
26 words
The plastic cap of claim 1 wherein the barrier plastic exhibits a permeance to gases of the atmosphere of less than about 0.9 cc/100 sq. in./mil/day.
Claim 5
Dependent Claim
15 words
The plastic cap of claim 1 wherein the barrier plastic is a vinylidene chloride copolymer.
Claim 6
Dependent Claim
11 words
The plastic cap of claim 1 wherein the metal is silver.
Claim 7
Dependent Claim
21 words
The plastic cap of claim 1 wherein the gas absorbing material comprises activated charcoal in the form of a solid particulate.
Claim 8
Dependent Claim
14 words
The plastic cap of claim 1 wherein the normally solid, plastic material is polypropylene.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |