US3872281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band type electric heaters
Assignee: Individual
•
Filing: 1974-06-05
•
Granted: 1975-03-18
•
Expires: 1994-06-05
Abstract
Abstract A band heater in which a heating element sandwiched between two mica covers is placed between a base member and a pressure band with sidewalls of the pressure band being interleaved with sidewalls of the base member. The interleaved sidewalls are bent inwardly into contact with the surface of the pressure band so that the pressure band and the base member are clamped together along their edges. When the heater is then bent into an object encircling configuration, the pressure band tightly presses the mica covers and the heating element together between the base member and the pressure band thereby minimizing distoration of the heating element when said element is raised to a high temperature during operation of the heater.
Inventors
- 👤 John W Krieg
- 👤 Alfred Gaudio
- 👤 Victor F Borek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:49
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/54; H05B3/56; H05B3/565
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A band type electric heater comprising a heating unit having a generally flat elongated heating element with electrical leads means thereon, a first dielectric member abutting one side of said heating element, a second dielectric member abutting the opposite side of said heating element, a metallic heat conducting base member abutting said first dielectric member, the opposite edges of said base member being folded in a 180* bend, a metallic heat conducting pressure band means abutting said second dielectric member, the opposite edges of said pressure band means being positioned within the folded edges of said base member and the thus interleaved edges of said base member and said pressure band means being folded back into abutment with the outer surface of said pressure band means whereby said base member and said pressure band means are interlocked along their opposite edges.
Claim 2
Dependent Claim
141 words
A band type electric heater comprising a heating unit having a generally flat elongated heating element with electrical leads means thereon, a first dielectric member abutting one side of said heating element, a second dielectric member abutting the opposite side of said heating element, a metallic heat conducting base member abutting said first dielectric member, the opposite edges of said base member being folded in a 180* bend, a metallic heat conducting pressure band means abutting said second dielectric member, the opposite edges of said pressure band means being positioned within the folded edges of said base member and the thus interleaved edges of said base member and said pressure band means being folded back into abutment with the outer surface of said pressure band means whereby said base member and said pressure band means are interlocked along their opposite edges.
Claim 3
Dependent Claim
44 words
A band type heater according to claim 1 wherein said pressure band means includes an extension piece at each end thereof, said extension pieces being folded around the ends of said heating unit into position between said first dielectric member and said base member.
Claim 4
Dependent Claim
151 words
A band type electric heater comprising a metallic base member the opposite longitudinal edges of which are folded in a 180* bend, aplurality of metallic pressure band members positioned adjacent each other across the width of said base member, the outside longitudinal edge of each outside pressure band member being positioned in the adjacent folded edge of said base member, said interleaved edges of said base member and said pressure band members being folded back into abutting relationship with said pressure band members to thereby interlock said base member and said pressure band members, the adjacent edges of adjacent pressure band members being folded in a 180* bend, a key member for engaging and interlocking with the folded back adjacent edges of said pressure band members, and electric heating unit means sandwiched between said pressure band members and said metallic base member said electric heating unit means having electrical leads means.
Claim 5
Dependent Claim
151 words
A band type electric heater comprising a metallic base member the opposite longitudinal edges of which are folded in a 180* bend, aplurality of metallic pressure band members positioned adjacent each other across the width of said base member, the outside longitudinal edge of each outside pressure band member being positioned in the adjacent folded edge of said base member, said interleaved edges of said base member and said pressure band members being folded back into abutting relationship with said pressure band members to thereby interlock said base member and said pressure band members, the adjacent edges of adjacent pressure band members being folded in a 180* bend, a key member for engaging and interlocking with the folded back adjacent edges of said pressure band members, and electric heating unit means sandwiched between said pressure band members and said metallic base member said electric heating unit means having electrical leads means.
Claim 6
Dependent Claim
42 words
A band type heater according to claim 3 wherein said electric heating unit means comprises a plurality of electric heating units, one for each pressure band member, each electric heating unit being positioned between a pressure band member and said base member.
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |