US4233523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive device
Assignee: Individual
•
Filing: 1979-01-22
•
Granted: 1980-11-11
•
Expires: 1999-01-22
Abstract
Abstract A pressure-sensitive device is proposed which includes an electrically conducting element in the form of a loop, a screen arranged outwardly of the loop, and a resiliently compressible, non-conducting material between the screen and element, the arrangement being such that, on the application of a loading to the screen, the electrical inductance of the loop is changed, such change being sensed by a reactance-dependent detecting circuit (DET) connected therewith.
Inventors
- 👤 Lars Jarder
- 👤 Bengt Ahlstroem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:37
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01; G08G1/042; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/31504; Y10T428/31678; Y10T428/31707; Y10T428/31826
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A pressure-sensitive device capable of responding electrically to applied mechanical forces, said device comprising: a body of a flexible, non-conductive material; at least one electrically conductive loop which has opposite ends thereto and is embedded in the said body; a reactance-dependent detecting circuit which is connected to the said loop ends externally of said body and is sensitive to the inductive reactance of the said loop; and a screen of electrically conductive material incorporated in said body and extending alongside the said loop; said body being deformable on application of mechanical forces thereto so as to cause the inductive reactance of the loop to change.
Claim 2
Dependent Claim
105 words
A pressure-sensitive device capable of responding electrically to applied mechanical forces, said device comprising: a body of a flexible, non-conductive material; at least one electrically conductive loop which has opposite ends thereto and is embedded in the said body; a reactance-dependent detecting circuit which is connected to the said loop ends externally of said body and is sensitive to the inductive reactance of the said loop; and a screen of electrically conductive material incorporated in said body and extending alongside the said loop; said body being deformable on application of mechanical forces thereto so as to cause the inductive reactance of the loop to change.
Claim 3
Dependent Claim
68 words
A pressure-sensitive device according to claim 1, wherein said body is of elongate form; a single length of wire extends along said elongate body between opposite ends thereof; said screen is in the form of a flexible cover surrounding said body; and said opposite ends of said elongate body are connected together so that the body has the form of a ring and said wire defines said loop.
Claim 4
Dependent Claim
47 words
A pressure-sensitive device according to claim 1, wherein said body is of elongate form; a doubled length of wire extends along said body from one end thereof so as to define said loop; and said screen is in the form of a flexible cover surrounding said body.
Claim 5
Dependent Claim
16 words
A pressure-sensitive device according to claim 1, wherein the said detecting circuit comprises an oscillator circuit.
Claim 6
Dependent Claim
20 words
A pressure-sensitive device according to claim 1 or claim 4, wherein the said screen extends wholly around the said loop.
References Cited (Backward Citations)
US3772684A
Cited
US3818369A
Cited
US3830991A
Cited
US3984764A
Cited
US4090045A
Cited
US4085394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |