Patent US4426573A successfully refreshed from Google Patents.
US4426573A
Expired / Lapsed
US
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PTC Heating element
Assignee: CS FUDICKAR KG
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Filing: 1981-12-10
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Granted: 1984-01-17
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Expires: 2001-12-10
Abstract
Abstract A heating element comprises an electrically nonconducting support body having a pair of opposite faces and formed with a plurality of throughgoing holes opening at the faces, respective electrically energizable heating capsules in the holes and each having one end exposed at one of the faces and an opposite end exposed at the other of the faces, and a pair of respective conductors lying on the faces in electrical contact with the respective exposed ends of the capsules. A tight hermetic skin surrounds and encapsulates the body with the capsules in the holes and the conductors on the faces. A pair of respective wires extending through the skin and connected to the conductors serve for passing electricity through the heating capsules. The skin effectively protects the assembly from moisture when installed in a heater. In addition this skin protects the heating element prior to installation and can in fact eliminate the need for a shipping package.
Inventors
- 👤 Carl S. Fudickar
- 👤 Peter Thies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:41
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; H05B3/40; H05B3/42; H05B3/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A heating element comprising: an electrically nonconducting support body having a pair of opposite faces and formed with a plurality of throughgoing holes opening at said faces; respective electrically energizable heating capsules in said holes and each having one end exposed at one of said faces and an opposite end exposed at the other of said faces; a pair of respective conductors lying on said faces in electrical contact with the respective exposed ends of said capsules; a tight heat conductive and electrically nonconductive skin surrounding and encapsulating said body with said capsules in said holes and said conductors on said faces, said skin being elastic and urging said conductors into snug engagement with said ends of said heating capsules; and means including a pair of respective wires extending through said skin and connected to said conductors for passing electricity through said heating capsules.
Claim 2
Dependent Claim
144 words
A heating element comprising: an electrically nonconducting support body having a pair of opposite faces and formed with a plurality of throughgoing holes opening at said faces; respective electrically energizable heating capsules in said holes and each having one end exposed at one of said faces and an opposite end exposed at the other of said faces; a pair of respective conductors lying on said faces in electrical contact with the respective exposed ends of said capsules; a tight heat conductive and electrically nonconductive skin surrounding and encapsulating said body with said capsules in said holes and said conductors on said faces, said skin being elastic and urging said conductors into snug engagement with said ends of said heating capsules; and means including a pair of respective wires extending through said skin and connected to said conductors for passing electricity through said heating capsules.
Claim 3
Dependent Claim
14 words
The heating element defined in claim 1 wherein said skin is durable and flexible.
Claim 4
Dependent Claim
14 words
The heating element defined in claim 1 wherein said conductors are durable and flexible.
Claim 5
Dependent Claim
14 words
The heating element defined in claim 1 wherein said skin is of silicone rubber.
Claim 6
Dependent Claim
29 words
The heating element defined in claim 4 wherein said skin is formed as a tube with sealed ends, said wires extending through one of said ends of said skin.
Claim 7
Dependent Claim
36 words
The heating element defined in claim 1 further comprising a heat-conducting mass surrounding said skin, whereby when said element is mounted in a cavity of a press platen or the like said mass conducts heat thereto.
Claim 8
Dependent Claim
24 words
The heating element defined in claim 1 wherein the ends of said capsules normally project slightly past the respective faces of said support body.
Claim 9
Dependent Claim
23 words
The heating element defined in claim 1 wherein the ends of the capsules bear against and are limitedly shiftable on the respective conductors.
References Cited (Backward Citations)
US3748439A
Cited
US3996447A
Cited
US4147927A
Cited
US4104509A
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US4086467A
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US4091267A
Cited
US4230935A
Cited
US4242567A
Cited
US4327282A
Cited
US4236065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |