Patent US3628093A successfully refreshed from Google Patents.
US3628093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostat overheat protection system for an electric appliance such as a blanket
Assignee: Nortel Networks Ltd
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Filing: 1970-04-13
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Granted: 1971-12-14
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Expires: 1990-04-13
Abstract
Abstract Temperature responsive protection system for an appliance such as an electric blanket which utilizes a pair of conductors which form a part of the heating or sensing circuit and which are insulated under normal temperature operating conditions by temperature responsive material which melts to establish electrical contact between the conductors if an overheat condition exists.
Inventors
- 👤 George C Crowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:44
CPC Classifications
H; H02; H02H; H02H5/00; H02H5/04; H02H5/042; H02H5/043
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A flexible electrical protective device for mounting in a flexible electrical applicance comprising: a flexible core of insulating material; a first flexible electrical conductor wound about said core; a flexible fusible insulating layer formed over said first conductor and said core; and a second flexible electrical conductor wound over said flexible fusible insulating layer and said first and second flexible electrical conductors making physical contact when said flexible fusible insulating layer melts.
Claim 2
Dependent Claim
72 words
A flexible electrical protective device for mounting in a flexible electrical applicance comprising: a flexible core of insulating material; a first flexible electrical conductor wound about said core; a flexible fusible insulating layer formed over said first conductor and said core; and a second flexible electrical conductor wound over said flexible fusible insulating layer and said first and second flexible electrical conductors making physical contact when said flexible fusible insulating layer melts.
Claim 3
Dependent Claim
17 words
A flexible electrical protective device according to claim 1 wherein said flexible fusible insulating layer is nylon.
Claim 4
Dependent Claim
17 words
A flexible electrical protective device according to claim 1 wherein said flexible fusible insulating layer is polyethylene.
Claim 5
Dependent Claim
17 words
A flexible electrical protective device according to claim 1 wherein said flexible fusible insulating layer is polyvinylchloride.
Claim 6
Dependent Claim
28 words
A flexible electrical protective device according to claim 1 including a flexible insulating protective cover formed over said second flexible electrical conductor and said flexible fusible insulating layer.
Claim 7
Dependent Claim
22 words
A protective device according to claim 5 wherein at least one of said first and second conductors is round in cross section.
Claim 8
Dependent Claim
20 words
A protective device according to claim 5 wherein at least one of said first and second conductors is ribbon shaped.
Claim 9
Dependent Claim
21 words
A protective device according to claim 5 wherein said first and second electrical conductors are heating elements for said flexible appliance.
Claim 10
Dependent Claim
29 words
A protective device according to claim 5 Wherein said first and second electrical conductors are formed of low resistance material and are not heating elements of said flexible appliance.
Claim 11
Dependent Claim
154 words
A protective device for a flexible electrical appliance comprising: a heating element formed with a core of flexible insulating material; a first flexible conductor wound about said core; a flexible fusible insulating layer covering said first flexible conductor and under normal operating conditions comprising an insulator and which under overheat conditions melts; a second flexible conductor wound about said flexible fusible insulating layer; said heating element mounted in said flexible appliance so as to provide substantially uniform heating; a pair of power leads with one of said leads connected to a first end of said first flexible conductor and the second end of said first flexible conductor connected to the first end of said second flexible conductor; and a current responsive switch with one side connected to the second end of the second flexible conductor, and the second of said pair of power leads connected to the other side of said current responsive switch.
Claim 12
Dependent Claim
154 words
A protective device for a flexible electrical appliance comprising: a heating element formed with a core of flexible insulating material; a first flexible conductor wound about said core; a flexible fusible insulating layer covering said first flexible conductor and under normal operating conditions comprising an insulator and which under overheat conditions melts; a second flexible conductor wound about said flexible fusible insulating layer; said heating element mounted in said flexible appliance so as to provide substantially uniform heating; a pair of power leads with one of said leads connected to a first end of said first flexible conductor and the second end of said first flexible conductor connected to the first end of said second flexible conductor; and a current responsive switch with one side connected to the second end of the second flexible conductor, and the second of said pair of power leads connected to the other side of said current responsive switch.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |