US3869595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated heated lunch box
Assignee: Individual
•
Filing: 1974-06-19
•
Granted: 1975-03-04
•
Expires: 1994-06-19
Abstract
Abstract An insulated lunch box is provided with a controllable electric heater and a water bath which is heated by the electric heater for providing heat in the lunch box and for cooking or heating items such as eggs and hot dogs. The lunch box is built with upper and lower portion with a food tray arranged on the lower portion above the water so that food therein can be heated thereby.
Inventors
- 👤 Walter Collins
- 👤 Howard Blankumsee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:58
CPC Classifications
A; A45; A45C; A45C11/00; A45C11/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
An insulated heated lunch box comprising a lower compartment unit having spaced dual walls and insulation positioned between said dual walls, an upper compartment unit including spaced dual walls and insulating material between said upper unit spaced dual walls, a peripheral flange on said upper unit engaging over said lower unit, means for detachably securing said upper unit to said lower portion an electric heater in said lower unit for heating water contained in said lower unit, electrical control means for controlling the amount of heat dissipated from said electric heater, rack means in said lower unit immersed in the water therein for supporting a plurality of food containers therein, a food tray, means on said food tray for supporting said food tray on said lower unit above the water level therein, and a cover for said food tray.
Claim 2
Dependent Claim
139 words
An insulated heated lunch box comprising a lower compartment unit having spaced dual walls and insulation positioned between said dual walls, an upper compartment unit including spaced dual walls and insulating material between said upper unit spaced dual walls, a peripheral flange on said upper unit engaging over said lower unit, means for detachably securing said upper unit to said lower portion an electric heater in said lower unit for heating water contained in said lower unit, electrical control means for controlling the amount of heat dissipated from said electric heater, rack means in said lower unit immersed in the water therein for supporting a plurality of food containers therein, a food tray, means on said food tray for supporting said food tray on said lower unit above the water level therein, and a cover for said food tray.
Claim 3
Dependent Claim
17 words
A device as claimed in claim 1 including a thermos bottle detachably secured in said upper unit.
Claim 4
Dependent Claim
22 words
A device as claimed in claim 1 wherein means are provided on said food tray for sealing engagement with said lower unit.
Claim 5
Dependent Claim
25 words
A device as claimed in claim 1 wherein the means controlling said electric unit includes a rheostat and hand adjustable means for controlling said rheostat.
Claim 6
Dependent Claim
30 words
A device as claimed in claim 1 wherein said means rack is supported on the inner wall of said lower unit and includes means for positively engaging said food containers.
Claim 7
Dependent Claim
21 words
A device as claimed in claim 1 including steam and hot air vents extending through the walls of said lower unit.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |