Patent US3914727A successfully refreshed from Google Patents.
US3914727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive-temperature-coefficient-resistor package
Assignee: Sprague Electric Co
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Filing: 1974-01-02
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Granted: 1975-10-21
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Expires: 1994-01-02
Abstract
Abstract A PTCR package, according to the present invention, has one or a plurality of stacked PTCR elements having at least two electrical film terminals on opposite faces of the stack. At least one metal heat conductor contacts one of the terminal faces. An insulating housing contains the PTCR elements and the heat conductors. The heat conductors are each in broad thermal contact with a portion of the inner wall of the housing such that thermal coupling is realized between the package environment and each PTCR element that is contacted by a heat conductor. A heat sinking metal part may contact the outer wall of the housing, opposite to the inner heat conductors so as to further enhance the thermal coupling to the environment.
Inventors
- 👤 John H Fabricius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:39
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/022; H01C1/00; H01C1/01; H01C1/014; H01C1/08; H01C1/084
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
141 words
A PTCR package comprising a. a PTCR body comprising at least one PTCR element, said body being cylindrical and having two flat end faces, said body having first and second metal film terminals being on said two end faces, respectively; b. at least one metal heat conductor cup having a flat bottom, said flat bottom of said one cup being in broad contiguous thermal contact with said first terminal; c. two electrical leads, each being electrically connected to one of said two terminals, respectively; d. a housing of an electrically insulating material of cylindrical geometry completely enclosing said PTCR body and said cups, the flange of said at least one cup being in broad contiguous thermal contact with a curved portion of the inner wall of said housing, each said lead extending through another portion of said wall of said housing.
Claim 2
Dependent Claim
141 words
A PTCR package comprising a. a PTCR body comprising at least one PTCR element, said body being cylindrical and having two flat end faces, said body having first and second metal film terminals being on said two end faces, respectively; b. at least one metal heat conductor cup having a flat bottom, said flat bottom of said one cup being in broad contiguous thermal contact with said first terminal; c. two electrical leads, each being electrically connected to one of said two terminals, respectively; d. a housing of an electrically insulating material of cylindrical geometry completely enclosing said PTCR body and said cups, the flange of said at least one cup being in broad contiguous thermal contact with a curved portion of the inner wall of said housing, each said lead extending through another portion of said wall of said housing.
Claim 3
Dependent Claim
15 words
The PTCR package of claim 1 wherein said housing is made of a thermoplastic material.
Claim 4
Dependent Claim
11 words
The PTCR package of claim 2 wherein said thermoplastic is polysulfone.
Claim 5
Dependent Claim
49 words
The PTCR package of claim 1 wherein said flat bottom of a second of said cups is in broad contiguous thermal contact with said second terminal, said flange of said second cup being in broad contiguous thermal contact with another curved portion of the inner wall of said housing.
Claim 6
Dependent Claim
45 words
The PTCR package of claim 4 further comprising at least one heat sinking metal part being in broad contiguous thermal contact with a portion of the outer wall of said housing in a region opposite to at least one of said curved inner wall portions.
Claim 7
Dependent Claim
96 words
The PTCR package of claim 4 wherein said cylindrical body and said cups are mounted coaxially within said cylindrical housing and said two leads each extend through one of the two end portions of said housing, said package additionally comprising two metal springs mounted coaxially within said housing, each contacting the inner portion of one of said leads, and said springs holding saId body and said cups in compression between said end portions of said housing, said compressed springs and cups serving as said electrical connections between said leads and said end terminals of said body.
Claim 8
Dependent Claim
39 words
The PTCR package of claim 6 wherein said thermal contacts with said first and second terminals are made to the bottom inside surfaces of said two heat conductor cups so as to partially contain said body within said cups.
Claim 9
Dependent Claim
29 words
The PTCR package of claim 6 wherein said thermal contacts with said first and second terminals are made to the bottom outside surfaces of said two heat conductor cups.
Claim 10
Dependent Claim
67 words
The PTCR package of claim 7 wherein the outside bottom surfaces of a third and a fourth of said heat conductor cups are in broad contiguous thermal contact with the outside bottom surfaces of said first and second cups, respectively, and said flanges of said third and fourth cups are in broad contiguous thermal contact with yet other curved portion of said inner wall of said housing.
Claim 11
Dependent Claim
28 words
The PTCR package of claim 1 wherein one of said PTCR elements has an anomaly temperature that is significantly higher than that of another of said PTCR elements.
Claim 12
Dependent Claim
69 words
The PTCR package of claim 10 having a heat sinking metal part in broad contiguous thermal contact with a curved outer surface portion of said housing, said part being positioned essentially opposite only to said flange of said at least one cup, said broad contiguous thermal contact between said at least one cup and said body being effected only to said one PTCR element having said higher anomally temperature.
Claim 13
Dependent Claim
36 words
The PTCR package of claim 1 wherein said PTCR body additionally comprises a layer of electrically insulating material positioned between two of said PTCR elements for reducing the thermal coupling therebetween and providing electrical insulation therebetween.
Claim 14
Dependent Claim
16 words
The PTCR package of claim 12 wherein said layer of insulating material is made of alumina.
Claim 15
Dependent Claim
59 words
The PTCR package of claim 12 wherein a third and a fourth of said terminals are on adjacent faces of said two PTCR elements having said layer therebetween, and wherein said package additionally comprises a third and a fourth electrical lead connected to said third and fourth terminal, respectively, and said leads extending through said wall of said housing.
Claim 16
Dependent Claim
38 words
The PTCR package of claim 1 additionally comprising two fusible metal links, each said connection between one of said leads and said corresponding body terminal being accomplsihed by series electrical connection through one of said fusible metal links.
Claim 17
Dependent Claim
29 words
The PTCR package of claim 1 wherein said body is comprised of at least two abutting PTCR elements, said elements having a metal film adhered to each abutting face.
Claim 18
Dependent Claim
64 words
The PTCR package of claim 6 wherein said body comprises two of said PTCR elements, said two elements being adjacent and having a third and fourth of said metal film terminals on their adjacent faces, respectively, said package additionally comprising a third electrical lead being connected to said third and fourth terminals and extending through said wall of said housing in a radial direction.
References Cited (Backward Citations)
US3365618A
Cited
US3644864A
Cited
US3673538A
Cited
US3697863A
Cited
US3737752A
Cited
US3748439A
Cited
US3749879A
Cited
US3750082A
Cited
US3794949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |