Patent US3947656A successfully refreshed from Google Patents.
US3947656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature controlled cartridge heater
Assignee: Fast Heat Element Manufacturing Co Inc
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Filing: 1974-08-26
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Granted: 1976-03-30
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Expires: 1994-08-26
Abstract
Abstract A temperature controlled electric heater for severing a web of vinyl film, which includes a metallic sheath having internal heater elements arranged in a ceramic core and has a thermistor nested in the core and in surface contact with the sheath for sensing the temperature of the heater, the sheath being adapted to heat sever the vinyl film web on contact therewith.
Inventors
- 👤 Frank Lodi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:55
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C66/81; B29C66/812; B29C66/8126; B29C66/81265; B29C66/90; B29C66/91; B29C66/912; B29C66/9121; B29C66/91211; B29C66/91212; B29C66/91213; B29C66/91231; B29C66/9131; B29C66/91311; B29C66/91317; B29C66/914; B29C66/9141; B29C66/91421; B29C66/91431; B29C66/9161; B29C66/91641; B29C66/91651; B29C66/91653; B29C66/91655; B29C66/96; B29C66/961; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20; G05D23/24; H; H05; H05B; H05B3/00; H05B3/0019; H05B3/40; H05B3/42; H05B3/48; B29C65/74; B29C65/743; B29C66/8122; B29C66/81261; B29C66/919; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
An electric heater assembly for severing a web of plastic film at a given temperature, comprising a metallic sheath having an outside roughened surface and adaptable to contact said plastic web, dielectric core means within and substantially coextensive with said sheath, a longitudinal passage within said core means, a heating element extending through and secured in said passage, a thermal resistance body arranged between said sheath and core means but insulated from said heating element and in surface contact with said sheath for sensing the temperature of said sheath, a circuit connecting said heating element and said thermal resistance body with a source of electric current, and means in said circuit responsive to the temperature sensed by said thermal resistance body for controlling the flow of current to the heating element to maintain said sheath at said given temperature.
Claim 2
Dependent Claim
139 words
An electric heater assembly for severing a web of plastic film at a given temperature, comprising a metallic sheath having an outside roughened surface and adaptable to contact said plastic web, dielectric core means within and substantially coextensive with said sheath, a longitudinal passage within said core means, a heating element extending through and secured in said passage, a thermal resistance body arranged between said sheath and core means but insulated from said heating element and in surface contact with said sheath for sensing the temperature of said sheath, a circuit connecting said heating element and said thermal resistance body with a source of electric current, and means in said circuit responsive to the temperature sensed by said thermal resistance body for controlling the flow of current to the heating element to maintain said sheath at said given temperature.
Claim 3
Dependent Claim
30 words
The heater assembly recited in claim 1, wherein said circuit includes lead wires extending out of one end of said sheath which connect said control means exterior of said sheath.
Claim 4
Dependent Claim
25 words
The heater assembly recited in claim 1, wherein said circuit control means comprises an integrated circuit including a comparator -- detector and a switching device.
Claim 5
Dependent Claim
21 words
The heater assembly recited in claim 1, wherein said circuit control means is connected across the output of a bridge circuit.
Claim 6
Dependent Claim
26 words
The heater assembly recited in claim 1, wherein the core means comprises axially aligned sections and the thermal resistance body is arranged between two adjacent sections.
Claim 7
Dependent Claim
19 words
The heater assembly recited in claim 1, wherein all voids in the sheath are filled with magnesium oxide powder.
Claim 8
Dependent Claim
135 words
An electric heater assembly for severing a web of plastic film at a given temperature, comprising a metallic sheath adaptable to contact said plastic web, a dielectric core means in said sheath substantially coextensive therewith, at least one longitudinal passage within said sheath, a heating element extending through said passage and secured therein by said core means, a thermal resistance body within said sheath and arranged between said sheath and core means and substantially in surface contact with said sheath, a dielectric thermal insulation pad arranged between said thermal resistance body and said core means, a circuit connecting said heating means and said thermal resistance body with a source of electric current, and means in said circuit for controlling the flow of current to the heating element to maintain said sheath at said given temperature.
Claim 9
Dependent Claim
135 words
An electric heater assembly for severing a web of plastic film at a given temperature, comprising a metallic sheath adaptable to contact said plastic web, a dielectric core means in said sheath substantially coextensive therewith, at least one longitudinal passage within said sheath, a heating element extending through said passage and secured therein by said core means, a thermal resistance body within said sheath and arranged between said sheath and core means and substantially in surface contact with said sheath, a dielectric thermal insulation pad arranged between said thermal resistance body and said core means, a circuit connecting said heating means and said thermal resistance body with a source of electric current, and means in said circuit for controlling the flow of current to the heating element to maintain said sheath at said given temperature.
Claim 10
Dependent Claim
12 words
The heater assembly recited in claim 7, wherein the sheath is tubular.
Claim 11
Dependent Claim
24 words
The heater assembly recited in claim 7, wherein the core has a flat surface upon which the pad and thermal resistance body are seated.
References Cited (Backward Citations)
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Cited
US2777931A
Cited
US3113198A
Cited
US3305820A
Cited
US3360693A
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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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |