US3760319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature detecting wire structure
Assignee: Individual
•
Filing: 1972-03-14
•
Granted: 1973-09-18
•
Expires: 1992-03-14
Abstract
Abstract Wire structures for detecting temperature rises above a predetermined level comprise a cylindrical core formed of nonconductive material, an electrically conductive first wire spirally wound around the core, a first thermosensitive layer coated on the first metal wire made of a mixture of resin binder and fine crystals of vanadium dioxide, an electrically conductive second wire spirally wound around the first thermosensitive layer, a second thermosensitive layer made of the same components as the first coated around the second metal wire and a coating of non-conductive resin covering the second thermosensitive layer. A method for making the temperature detecting wire structure is disclosed, such method being claimed in a divisional patent.
Inventors
- 👤 T Kawazoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:05
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A temperature detecting wire structure which comprises: A. a cylindrical core formed of non-conductive material, B. an electrically conductive first metal wire spirally wound around said core, C. a first thermosensitive layer coated on said first metal wire consisting essentially of a mixture of a resin binder and fine crystals of vanadium dioxide, D. an electrically conductive second metal wire spirally wound around said first thermosensitive layer, E. a second thermosensitive layer consisting essentially of the same components as said first thermosensitive layer coated on said second metal wire, and F. a coating of non-conductive resin covering said second thermosensitive layer.
Claim 2
Dependent Claim
101 words
A temperature detecting wire structure which comprises: A. a cylindrical core formed of non-conductive material, B. an electrically conductive first metal wire spirally wound around said core, C. a first thermosensitive layer coated on said first metal wire consisting essentially of a mixture of a resin binder and fine crystals of vanadium dioxide, D. an electrically conductive second metal wire spirally wound around said first thermosensitive layer, E. a second thermosensitive layer consisting essentially of the same components as said first thermosensitive layer coated on said second metal wire, and F. a coating of non-conductive resin covering said second thermosensitive layer.
Claim 3
Dependent Claim
32 words
A wire structure of claim 1 that exhibits about a 1000 fold change in electrical resistance as the temperature of the wire structure rises through the range of 65* to 75* C.
Claim 4
Dependent Claim
24 words
A wire structure of claim 1 that has a second outer coating of non-conductive resin encasing said coating that covers said second thermosensitive layer.
Claim 5
Dependent Claim
26 words
A wire structure of claim 1 wherein said first metal wire is a strip of metal foil about 0.05 mm. thick and about 0.4 mm. wide.
Claim 6
Dependent Claim
26 words
A wire structure of claim 4 wherein said second metal wire is a strip of metal foil about 0.05 mm. thick and about 0.4 mm. wide.
Claim 7
Dependent Claim
26 words
A wire structure of claim 1 wherein said second metal wire is spirally wound opposite to the direction of spiral winding of said first metal wire.
Claim 8
Dependent Claim
29 words
A wire structure of claim 6 wherein said first metal wire is spirally wound in an anti-clockwise direction and said second metal wire is wound in a clockwise direction.
Claim 9
Dependent Claim
17 words
A wire structure of claim 1 wherein said metal wires are narrow strips of copper metal foil.
Claim 10
Dependent Claim
18 words
A wire structure of claim 1 wherein said metal wires are narrow strips of copper-containing cadmium metal foil.
Claim 11
Dependent Claim
24 words
A wire structure of claim 1 wherein said coating of non-conductive resin covering said second thermosensitive layer is polyamide resin or polyvinyl chloride resin.
Claim 12
Dependent Claim
16 words
A wire structure of claim 1 wherein said cylindrical core comprises a bundle of glass fibers.
Claim 13
Dependent Claim
41 words
A wire structure of claim 1 wherein said first and second thermosensitive layers have a thickness of about 70 to 200 microns and the wire structure is for use as an attachment to the heating wire of an electrically heated blanket.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |