USRE32026E
Expired / Lapsed
US
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Structure of warmer
Assignee: Asahi Kasei Corp
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Filing: 1984-04-13
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Granted: 1985-11-12
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Expires: 2004-04-13
Abstract
Abstract A unified structure of a warmer is obtained by accommodating an exothermic composition consisting of iron powder, a chloride or sulfate of a metal having a tendency of ionization greater than iron, active carbon and water in a bag composed of a cloth or cloths and a film or films having aeration holes and encapsulating the resulting warmer in an air-tight envelope. Heat of oxidation of iron powder is utilized for the purpose for creating and keeping warmth.
Inventors
- 👤 Iwao Yamashita
- 👤 Miyuki Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:18
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/02; A61F7/03; A61F7/032; A61F7/034; F; F24; F24V; F24V30/00; A61F2007/036; A61F2007/038; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
168 words
A unified structure of a warmer and an air-tight envelope which is used to encapsulate sealingly said warmer at non-service time, said warmer comprising means for enclosing an exothermic composition in contact with water, said means comprising a two layered bag composed of at least one air-permeable cloth layer and at least one impermeable film layer having aeration holes with a predetermined total area and arranged one within the other; said enclosing means being disposed within said air-tight envelope; and said exothermic composition which is activated on contact with air .[.being selected from the group consisting of iron powder, a chloride and a sulfate of a metal having an ionization tendency greater than iron and active carbon.]. .Iadd.comprising iron powder, active carbon and a reaction promoter selected from the group consisting of a chloride and a sulfate of a metal having an ionization tendency greater than iron .Iaddend.filled in said bag, whereby upon opening of said airtight evelope, air contacts said exothermic composition and water to produce heat.
Claim 2
Dependent Claim
168 words
A unified structure of a warmer and an air-tight envelope which is used to encapsulate sealingly said warmer at non-service time, said warmer comprising means for enclosing an exothermic composition in contact with water, said means comprising a two layered bag composed of at least one air-permeable cloth layer and at least one impermeable film layer having aeration holes with a predetermined total area and arranged one within the other; said enclosing means being disposed within said air-tight envelope; and said exothermic composition which is activated on contact with air .[.being selected from the group consisting of iron powder, a chloride and a sulfate of a metal having an ionization tendency greater than iron and active carbon.]. .Iadd.comprising iron powder, active carbon and a reaction promoter selected from the group consisting of a chloride and a sulfate of a metal having an ionization tendency greater than iron .Iaddend.filled in said bag, whereby upon opening of said airtight evelope, air contacts said exothermic composition and water to produce heat.
Claim 3
Dependent Claim
39 words
A unified structure of claim 1 wherein said film having aeration holes provides the amount of air permeation as measured by the air permeation test according to Frazier type method in the range of 0.5-400 cc/cm 2 . min.
Claim 4
Dependent Claim
13 words
A unified structure of claim 1 wherein said cloth is a non-woven fabric.
Claim 5
Dependent Claim
51 words
A unified structure of claim 1 wherein said chloride of a metal having an ionization tendency greater than iron is one member selected from the group consisting of KCl, NaCl, CaCl 2 and MgCl 2 in an amount of 0.5-30 parts by weight per 100 parts by weight of iron powder.
Claim 6
Dependent Claim
63 words
A unified structure of claim 1 wherein said sulfate of a metal having an ionization tendency greater than iron is one member selected from the group consisting of K 2 SO 4 , Na 2 SO 4 , MgSO 4 and Fe 2 (SO 4 ) 3 in an amount of 2.5-400 parts by weight per 100 parts by weight of iron powder.
Claim 7
Dependent Claim
37 words
A unified structure of claim 1 wherein said active carbon has a particle size of 104μ or smaller and is used in an amount of 2.5-400 parts by weight per 100 parts by weight of iron powder.
Claim 8
Dependent Claim
26 words
A unified structure of claim 1 wherein water is used in an amount of 30-1,000 parts by weight per 100 parts by weight of iron powder.
Claim 9
Dependent Claim
17 words
A unified structure of claim 1 wherein iron powder has a particle size of 200μ or smaller.
Claim 10
Dependent Claim
17 words
A unified structure of claim 1 wherein said air-tight envelope is a laminate of synthetic resin films.
Claim 11
Dependent Claim
22 words
A unified structure of claim 1 wherein said air-tight envelope is a laminate of a synthetic resin film and an aluminum foil.
Claim 12
Dependent Claim
15 words
The structure of claim 1 wherein said cloth layer is disposed within said film layer.
Claim 13
Dependent Claim
15 words
The structure of claim 1 wherein said film layer is disposed within said cloth layer.
Claim 14
Dependent Claim
168 words
A unified structure of a warmer and an air-tight envelope, said warmer comprising means for enclosing an exothermic composition in contact with water, said means comprising a three layered bag composed of at least one air permeable cloth layer, a stupe layer provided on one side of said bag, and at least one impermeable film layer having aeration holes with a predetermined total area and arranged one within the other; said enclosing means being disposed within said air-tight envelope; and said exothermic composition which is activated in contact with air .[.being selected from the group consisting of iron powder, a chloride and a sulfate of a metal having an ionization tendency greater than iron, and active carbon,.]. .Iadd.comprising iron powder, active carbon and a reaction promotor selected from the group consisting of a chloride and a sulfate of a metal having an ionization tendency greater than iron, .Iaddend.filled in said bag, whereby upon opening of said airtight envelope air contacts said exothermic composition and water to produce heat.
Claim 15
Dependent Claim
168 words
A unified structure of a warmer and an air-tight envelope, said warmer comprising means for enclosing an exothermic composition in contact with water, said means comprising a three layered bag composed of at least one air permeable cloth layer, a stupe layer provided on one side of said bag, and at least one impermeable film layer having aeration holes with a predetermined total area and arranged one within the other; said enclosing means being disposed within said air-tight envelope; and said exothermic composition which is activated in contact with air .[.being selected from the group consisting of iron powder, a chloride and a sulfate of a metal having an ionization tendency greater than iron, and active carbon,.]. .Iadd.comprising iron powder, active carbon and a reaction promotor selected from the group consisting of a chloride and a sulfate of a metal having an ionization tendency greater than iron, .Iaddend.filled in said bag, whereby upon opening of said airtight envelope air contacts said exothermic composition and water to produce heat.
Claim 16
Dependent Claim
17 words
A unified structure of claim 13 wherein said air-tight envelope is a laminate of synthetic resin films.
Claim 17
Dependent Claim
22 words
A unified structure of claim 13 wherein said air-tight envelope is a laminate of a synthetic resin film and an aluminum foil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |