Patent US3874365A successfully refreshed from Google Patents.
US3874365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained immersion exothermic fuel charge
Assignee: Individual
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Filing: 1974-07-10
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Granted: 1975-04-01
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Expires: 1994-07-10
Abstract
Abstract An immersion heater having a combustible heating charge in helical tubular form. The heating charge is form-stable and constituted of a combustible composition in unitary helical configuration. A refractory material is interposed between each convolution of the heat generating helix. In the preferred form of the invention, the heating charge is bonded to the inner wall of a tubular receptacle for immersion in a medium to be heated in its container.
Inventors
- 👤 Thurman Pava
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:32
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/24; A47J36/30; F; F24; F24V; F24V30/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
Immersion heater comprising a heating charge, including a combustible mixture of unitary helical configuration and a refractory material interposed between adjacent convolutions of the combustible mixture, said heating charge being of tubular cross section from end to end and disposed within a receptacle.
Claim 2
Dependent Claim
43 words
Immersion heater comprising a heating charge, including a combustible mixture of unitary helical configuration and a refractory material interposed between adjacent convolutions of the combustible mixture, said heating charge being of tubular cross section from end to end and disposed within a receptacle.
Claim 3
Dependent Claim
20 words
Immersion heater as set forth in claim 1 in which said heating charge is form stable during and after combustion.
Claim 4
Dependent Claim
37 words
Immersion heater as set forth in claim 2 in which said receptacle is tubular and said heating charge is bonded to the inner wall of said receptacle and being spaced therefrom by a layer of refractory material.
Claim 5
Dependent Claim
64 words
Immersion heater as set forth in claim 2 in which said combustible mixture is composed of a mixture of iron oxide, aluminum, refractory filler and a binder to hold the constituents thereof in said form stable condition during and after combustible reaction of the mixture and in which said refractory material is in helical form and serves as a skeleton for the combustible mixture.
Claim 6
Dependent Claim
31 words
Immersion heater as set forth in claim 3 in which igniter means is provided for igniting said combustible mixture, said igniting means including a fuse extending outwardly of said tubular receptacle.
Claim 7
Dependent Claim
77 words
Immersion heater as set forth in claim 5 in which said heater is disposed within a sealed container for holding a beverage or food to be heated, said container having vent means opening through the top wall thereof, and a sealing strip removably bonded to the top wall of said container sealing said vent means and preventing access to said fuse whereby removal of said sealing strip provides access to said fuse and simultaneously vents said container.
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 |