US4159459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-inductive cylindrical thin film resistor
Assignee: Angstrohm Precision Inc
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Filing: 1977-06-23
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Granted: 1979-06-26
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Expires: 1997-06-23
Abstract
Abstract A thin film, cylindrical resistor is disclosed which exhibits non-inductive characteristics and which may be fabricated easily and economically. A cylindrical insulative substrate is provided with electrically conductive termination bands and a thin coating of electrically resistive material over the entire cylindrical surface. The resistive material is then cut along an axial path and along an interrupted spiral path so as to form the resistive material into a serpentine path along the cylindrical substrate. Leads are attached to each end and as the current traverses the length of the cylinder it travels in a serpentine path. The current travels in opposite directions along adjacent parallel portions of the path thereby cancelling out the major portion of inductance.
Inventors
- 👤 D. Lamar Sease
- 👤 Benjamin Solow
- 👤 Eduard F. Boeckmann
- 👤 David Rabinow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:13
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/22; H01C7/006; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A low-inductance electrical resistor comprising a generally cylindrical insulating substrate with a thin electrically resistance film covering substantially its entire exterior surface, and connecting leads electrically connected to said resistive film, said resistive film having a plurality of cuts therethrough, one extending substantially the length of the resistor generally parallel to its longitudinal axis and another extending in an interrupted spiral so as to define a serpentine electrical path along the length of the resistor.
Claim 2
Dependent Claim
75 words
A low-inductance electrical resistor comprising a generally cylindrical insulating substrate with a thin electrically resistance film covering substantially its entire exterior surface, and connecting leads electrically connected to said resistive film, said resistive film having a plurality of cuts therethrough, one extending substantially the length of the resistor generally parallel to its longitudinal axis and another extending in an interrupted spiral so as to define a serpentine electrical path along the length of the resistor.
Claim 3
Dependent Claim
13 words
The electrical device of claim 1 wherein the substrate is a hollow cylinder.
Claim 4
Dependent Claim
13 words
The electrical device of claim 1 wherein said substrate is a solid cylinder.
Claim 5
Dependent Claim
13 words
The electrical device of claim 1 wherein the substrate is a ceramic material.
Claim 6
Dependent Claim
18 words
The electrical device of claim 4 wherein the ceramic material is 96% Alumina (Al 2 O 3 ).
Claim 7
Dependent Claim
14 words
The electrical device of claim 4 wherein the ceramic material is alkaline earth porcelain.
Claim 8
Dependent Claim
17 words
The electrical device of claim 1 wherein the thin electrically resistive film is a nickel chromium alloy.
Claim 9
Dependent Claim
23 words
The electrical device of claim 7 wherein the composition of the nickel chromium alloy is 75% nickel, 20% chromium and 5% trace metals.
Claim 10
Dependent Claim
15 words
The electrical device of claim 1 wherein the thin electrically resistive film is deposited carbon.
Claim 11
Dependent Claim
15 words
The electrical device of claim 1 wherein the thin electrically resistive film is tin oxide.
Claim 12
Dependent Claim
15 words
The electrical device of claim 1 wherein the thin electrically resistive film is tantalum nitride.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |