US3874504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical thermal pack
Assignee: Individual
•
Filing: 1973-05-24
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Granted: 1975-04-01
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Expires: 1993-05-24
Abstract
Abstract A chemical thermal pack which in the preferred embodiment has a sealed intermediate envelope filled with a powder that produces or absorbs heat when dissolved in water and a quantity of water separated from the powder by a membrane that may be ruptured readily. A relatively flat, sealed, flexible outer pouch slidably receives the filled intermediate envelope and a heat insulation sheet that is located along the inside of one major face of the pouch to retard heat transfer there when the pouch is squeezed manually to rupture the membrane. An insulated pack containing gel is also provided.
Inventors
- 👤 John P Verakas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:18
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/02; A61F7/03; B; B65; B65D; B65D81/00; B65D81/32; B65D81/3261; B65D81/3272; F; F24; F24V; F24V30/00; A61F2007/0268; A61F2007/0276; A61F7/10; A61F7/106; B65D81/34; B65D81/3484
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
In a chemical thermal pack having a flexible, liquid-tight outer pouch, a liquid solvent and particulate material which produces heat or absorbs heat when contacted by said liquid solvent, and a liquid-proof inner bag filled with said liquid solvent and separating it from said particulate material, said inner bag being readily rupturable by said liquid solvent when squeezed manually, the improvement which comprises: a flexible, liquid-tight intermediate envelope containing said particulate material and the solvent-filled inner bag, said intermediate envelope being slidably received snugly in said outer pouch and being substantially nonrupturable when squeezed manually; and a thin, flexible sheet of heat insulation material slidably received in said pouch between one side of the pouch and said intermediate envelope.
Claim 2
Dependent Claim
119 words
In a chemical thermal pack having a flexible, liquid-tight outer pouch, a liquid solvent and particulate material which produces heat or absorbs heat when contacted by said liquid solvent, and a liquid-proof inner bag filled with said liquid solvent and separating it from said particulate material, said inner bag being readily rupturable by said liquid solvent when squeezed manually, the improvement which comprises: a flexible, liquid-tight intermediate envelope containing said particulate material and the solvent-filled inner bag, said intermediate envelope being slidably received snugly in said outer pouch and being substantially nonrupturable when squeezed manually; and a thin, flexible sheet of heat insulation material slidably received in said pouch between one side of the pouch and said intermediate envelope.
Claim 3
Dependent Claim
44 words
A thermal pack according to claim 1, wherein said pouch has opposite major faces which are joined to each other at the edges of the pouch, and said sheet of insulation material extends substantially completely across one of said major faces at the inside.
Claim 4
Dependent Claim
118 words
In a chemical thermal pack having a flexible, liquid-tight outer pouch, a liquid solvent and particulate material which produces heat or absorbs heat when contacted by said liquid solvent, and a liquid-proof inner bag filled with said liquid solvent and separating it from said particulate material, said inner bag being readily rupturable by said liquid solvent when squeezed manually, the improvement which comprises: a flexible, liquid-tight intermediate envelope containing said particulate material and the solvent-filled inner bag, said intermediate envelope being received snugly in said outer pouch and being substantially nonrupturable when squeezed manually; and a thin, flexible sheet of heat insulation material slidably received in said pouch between one side of the pouch and said intermediate envelope.
Claim 5
Dependent Claim
118 words
In a chemical thermal pack having a flexible, liquid-tight outer pouch, a liquid solvent and particulate material which produces heat or absorbs heat when contacted by said liquid solvent, and a liquid-proof inner bag filled with said liquid solvent and separating it from said particulate material, said inner bag being readily rupturable by said liquid solvent when squeezed manually, the improvement which comprises: a flexible, liquid-tight intermediate envelope containing said particulate material and the solvent-filled inner bag, said intermediate envelope being received snugly in said outer pouch and being substantially nonrupturable when squeezed manually; and a thin, flexible sheet of heat insulation material slidably received in said pouch between one side of the pouch and said intermediate envelope.
Claim 6
Dependent Claim
44 words
A thermal pack according to claim 3, wherein said pouch has opposite major faces which are joined to each other at the edges of the pouch, and said sheet of insulation material extends substantially completely across one of said major faces at the inside.
Claim 7
Dependent Claim
92 words
In a chemical thermal pack having a flexible, liquid-tight outer pouch, and chemicals inside said outer pouch which are capable of producing and maintaining an elevated or depressed temperature in said outer pouch and at the outside therof, the improvement which comprises: a flexible, liquid-tight intermediate envelope containing said chemicals, said intermediate envelope being received snugly in said outer pouch and being substantially nonrupturable when squeezed manually; and a thin, flexible sheet of heat insulation material slidably received in said outer pouch between one side of the pouch and said intermediate envelope.
Claim 8
Dependent Claim
92 words
In a chemical thermal pack having a flexible, liquid-tight outer pouch, and chemicals inside said outer pouch which are capable of producing and maintaining an elevated or depressed temperature in said outer pouch and at the outside therof, the improvement which comprises: a flexible, liquid-tight intermediate envelope containing said chemicals, said intermediate envelope being received snugly in said outer pouch and being substantially nonrupturable when squeezed manually; and a thin, flexible sheet of heat insulation material slidably received in said outer pouch between one side of the pouch and said intermediate envelope.
Claim 9
Dependent Claim
17 words
A thermal pack according to claim 5, wherein said chemicals are in the form of a gel.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |