US5133351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-frequency electrotherapeutic device
Assignee: Individual
•
Filing: 1990-03-14
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Granted: 1992-07-28
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Expires: 2010-03-14
Abstract
Abstract A novel low-frequency electrotherapeutic device wherein a low-frequency voltage having a ratio of positive voltage component to negative voltage component in the range of about 0.1:1-0.5:1 is used. The electrotherapeutic device can be advantageously used to massage human body or to iontophorese medicament thereinto without causing unwanted discomforts such as pain, inflammation and burning which are inevitable in conventional low-frequency electrotherapy.
Inventors
- 👤 Kazumi Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:37
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/0404; A61N1/0408; A61N1/0428; A61N1/0432; A61N1/044; A61N1/18; A61N1/32; A61N1/322; A61N1/325; A61N1/0436
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
In a low-frequency electrotherapeutic device which comprises an oscillator capable of generating a low-frequency voltage and a pair of electrodes connected to an output terminal of said oscillator, the low-frequency voltage being applied to a human body through said pair of electrodes, the improvement wherein said low-frequency voltage has a ratio of positive voltage component to negative voltage component in the range of about 0.1:1-0.5:1 and in the low-frequency voltage its reverse energy is larger than forward energy thereof.
Claim 2
Dependent Claim
79 words
In a low-frequency electrotherapeutic device which comprises an oscillator capable of generating a low-frequency voltage and a pair of electrodes connected to an output terminal of said oscillator, the low-frequency voltage being applied to a human body through said pair of electrodes, the improvement wherein said low-frequency voltage has a ratio of positive voltage component to negative voltage component in the range of about 0.1:1-0.5:1 and in the low-frequency voltage its reverse energy is larger than forward energy thereof.
Claim 3
Dependent Claim
17 words
The device of claim 1, wherein said low-frequency voltage is a pulsating voltage having a pulse interval.
Claim 4
Dependent Claim
20 words
The device of claim 2, wherein the pulse interval of said pulsating voltage increases and decreases at prescribed time intervals.
Claim 5
Dependent Claim
15 words
The device of claim 1, wherein said low-frequency voltage has a diphasic action potential waveform.
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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) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |