US3766508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-proof coated resistors
Assignee: Panasonic Holdings Corp
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Filing: 1972-07-03
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Granted: 1973-10-16
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Expires: 1992-07-03
Abstract
Abstract An electrical resistor of flame-proof type comprising a resistance material coated substrate formed with or without a plurality of grooves determinant of the value of the resultant resistor, wherein glass is applied thereon in various configurations for enabling the resultant resistor to quickly fuse to open an electrical circuit in which it is inserted.
Inventors
- 👤 T Wada
- 👤 Y Shindo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:40
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
An electrical resistor comprising a substrate of electrically insulating material, a thin film of resistance material coated on said substrate, glass applied on only a portion of said resistor film, conducting terminals provided at two ends of said resistor and lead wires soldered to said ends, respectively, and a protective coating formed over the entire surface of said coated substrate, whereby upon receipt of severe load said glass is fused by heat evolved by said resistor film to destroy said resistor film thereby permitting the resistor to open circuit in which said resistor is inserted.
Claim 2
Dependent Claim
95 words
An electrical resistor comprising a substrate of electrically insulating material, a thin film of resistance material coated on said substrate, glass applied on only a portion of said resistor film, conducting terminals provided at two ends of said resistor and lead wires soldered to said ends, respectively, and a protective coating formed over the entire surface of said coated substrate, whereby upon receipt of severe load said glass is fused by heat evolved by said resistor film to destroy said resistor film thereby permitting the resistor to open circuit in which said resistor is inserted.
Claim 3
Dependent Claim
15 words
An electrical resistor as claimed in claim 1, wherein said resistance material is metal oxide.
Claim 4
Dependent Claim
14 words
An electrical resistor as claimed in claim 1, wherein said resistance material is metal.
Claim 5
Dependent Claim
14 words
An electrical resistor as claimed in claim 1, wherein said resistance material is carbon.
Claim 6
Dependent Claim
30 words
An electrical resistor as claimed in claim 1, wherein said thin film of resistance materiAl is provided with a plurality of grooves determinant of the resistance of the resultant resistor.
Claim 7
Dependent Claim
108 words
An electrical resistor comprising a substrate of electrically insulating material, a thin film of resistance material coated on said substrate, a plurality of grooves formed in said thin film on said substrate, glass applied on only a portion of said resistor film, conducting terminals provided at two ends of said resistor and lead wire soldered to said ends, respectively, and a protective coating formed over the entire surface of said coated substrate, whereby upon receipt of severe load said glass is fused by heat evolved by said resistor film to destroy said resistor film thereby permitting the resistor to open a circuit in which said resistor is inserted.
Claim 8
Dependent Claim
108 words
An electrical resistor comprising a substrate of electrically insulating material, a thin film of resistance material coated on said substrate, a plurality of grooves formed in said thin film on said substrate, glass applied on only a portion of said resistor film, conducting terminals provided at two ends of said resistor and lead wire soldered to said ends, respectively, and a protective coating formed over the entire surface of said coated substrate, whereby upon receipt of severe load said glass is fused by heat evolved by said resistor film to destroy said resistor film thereby permitting the resistor to open a circuit in which said resistor is inserted.
Claim 9
Dependent Claim
42 words
An electrical resistor as claimed in claim 6, wherein the body of said glass applied on the thin film of resistance material on the substrate extends in parallel relation to the longitudinal axis of said substrate crossing a plurality of the grooves.
Claim 10
Dependent Claim
42 words
An electrical resistor as claimed in claim 6, wherein the body of said glass applied on the thin film of resistance material on the substrate extends in the form of a ring and located at a substantially intermediate portion of said substrate.
Claim 11
Dependent Claim
44 words
An electrical resistor as claimed in claim 6, wherein the body of said glass applied on the thin film of resistance material on the substrate extends in parallel relation to and not crossing over the grooves at a substantially intermediate portion of said substrate.
Claim 12
Dependent Claim
51 words
An electrical resistor as claimed in claim 6, wherein the body of said glass applied on the thin film of resistance material on the substrate extends in parallel relation to the longitudinal axis of said substrate and sandwiched between two adjacent grooves located at a substantially intermediate portion of said substrate.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |