US3999552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epilator
Assignee: Universal Technology Inc
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Filing: 1975-05-20
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Granted: 1976-12-28
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Expires: 1995-05-20
Abstract
Abstract An epilator comprising a radio frequency signal generator, a high impedance hair gripper, and a shielded transmission line therebetween. The transmission line has a length of 0.15 to 0.50 of a quarter wave length greater than an odd quarter wave length of the signal considering the velocity factor of the line, and a variable impedance matching network is disposed between the signal generator and the gripper.
Inventors
- 👤 William H. Huggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:40
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B2018/00315; A61B2018/00452; A61B2018/00476
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
In an epilator comprising means for generating a radio frequency signal and a metallic hair gripping means for gripping a hair in spaced relation to the skin connected to said generating means, the improvement comprising a shielded transmission radio frequency line connected between the output of said generating means and said gripping means having a length between 0.15 and 0.50 of a quarter wave length greater than an odd quarter wave length of said line considering the velocity factor of said line.
Claim 2
Dependent Claim
82 words
In an epilator comprising means for generating a radio frequency signal and a metallic hair gripping means for gripping a hair in spaced relation to the skin connected to said generating means, the improvement comprising a shielded transmission radio frequency line connected between the output of said generating means and said gripping means having a length between 0.15 and 0.50 of a quarter wave length greater than an odd quarter wave length of said line considering the velocity factor of said line.
Claim 3
Dependent Claim
37 words
The epilator of claim 1 wherein said line has a length between 0.30 and 0.35 of a quarter wave length greater than an odd quarter wave length of said line considering the velocity factor of said line.
Claim 4
Dependent Claim
39 words
The epilator of claim 1 wherein said line has a characteristic impedance, said gripping means has a substantially greater impedance than said characteristic impedance, and an adjustable impedance matching network is provided between said generating means and said line.
References Cited (Backward Citations)
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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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |