Patent US3751650A successfully refreshed from Google Patents.
Patent US3657516A successfully refreshed from Google Patents.
US3657516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible panel-type heating unit
Assignee: Kansai Hoon Kogyo KK
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Filing: 1970-10-30
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Granted: 1972-04-18
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Expires: 1990-10-30
Abstract
Abstract A flexible panel-type heating unit in the form of a sealed integral assembly comprising an electrically resistive paper or felt-like porous board having at least one pair of electrodes contacting at its opposite ends. The resistive board and electrodes are sandwiched and sealed by layers of paper or cloth sheets impregnated with a synthetic resin. This new panel-type flexible heating unit has a stable electrical resistance, generates heat uniformly at the entire portions at a desired temperature, automatically maintains the given temperature, allows heating of not only planar but also curved surfaces, and eliminates the provision of temperature-controlling means such as thermostat.
Inventors
- 👤 Katsuji Fujihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:22
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/74; B65D88/744; E; E01; E01C; E01C11/00; E01C11/24; E01C11/26; E01C11/265; E04; E04D; E04D13/00; E04D13/10; E04D13/103; F; F24; F24D; F24D13/00; F24D13/02; F24H; F24H9/00; F24H9/18; F24H9/1809; F24H9/1818; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; H05B3/20; H05B3/34; H05B3/342; H05B2203/00; H05B2203/002; H05B2203/005; H05B2203/011; H05B2203/017; H05B2203/026; H05B2203/034; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
27 words
A flexible panel-like heating unit according to claim 1, in which said sheet impregnated with a synthetic resin is a paper sheet impregnated with diallyl phthalate resin.
Claim 2
Dependent Claim
43 words
A flexible panel-like heating unit according to claim 1, in which said heating unit is bonded integrally to the surface of a planar object including veneer plate, plywood plate, metal plate to provide a panel-like plank capable of generating heat as an entirety.
Claim 3
Dependent Claim
96 words
A flexible panel-like heating unit according to claim 1, which is of a substantially great length and comprises a pair of lead wires running along the opposite sides of said electrically resistive board longitudinally thereof in spaced non-contacting relation relative to said board, a plurality of electrodes extending from the respective lead wires in alternate fashion in the direction traversing said board and in contact therewith at predetermined distances between the respective adjacent electrodes so that a full voltage may be applied between the resulting plurality of electrodes extending from said pair of opposing lead wires.
Claim 4
Dependent Claim
44 words
A flexible panel-like heating unit according to claim 4, in which each of said pair of lead wires is composed of a plurality of lead wires so that the flow of current passing through the electrodes is shared by these plurality of lead wires.
Claim 5
Dependent Claim
24 words
A flexible panel-like heating unit according to claim 4, in which the adjacent electrodes are arranged at a uniform distance relative to each other.
Claim 6
Dependent Claim
24 words
A flexible panel-like heating unit according to claim 5, in which the adjacent electrodes are arranged at a uniform distance relative to each other.
Claim 7
Dependent Claim
27 words
A flexible panel-like heating unit according to claim 1, in which said sheet impregnated with a synthetic resin is a cloth sheet impregnated with diallyl phthalate resin.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |