US3906933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determination of skin type
Assignee: LOVIDA AG
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Filing: 1974-04-05
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Granted: 1975-09-23
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Expires: 1994-04-05
Abstract
Abstract The skin type is determined by using at least one print carrier with an electrostatically chargeable printing surface, having a surface tension of less than 30 dynes per centimeter, for making an electrostatic sebum content imprint of the skin and for storing said electrostatic imprint on the stamp surface. Good determination of the facial skin type is achieved by taking an imprint each from the forehead, chin and both cheeks.
Inventors
- 👤 Wladimir Tur
- 👤 Eugen Wyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:52
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/44; A61B5/441
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A device for recording skin conditions for the determination of skin type on the basis of the sebum content of the skin, comprising a printing stamp having a smooth working surface for application against the skin, said working surface comprising means for electrostatically attracting and retaining sebum and other accumulations from the skin to thereby provide an electrostatic sebum content imprint of the skin, said electrostatic attracting and retaining means consisting of an electrostatically charged material with a surface tension of less than 30 dynes per centimeter.
Claim 2
Independent Claim
87 words
A device for recording skin conditions for the determination of skin type on the basis of the sebum content of the skin, comprising a printing stamp having a smooth working surface for application against the skin, said working surface comprising means for electrostatically attracting and retaining sebum and other accumulations from the skin to thereby provide an electrostatic sebum content imprint of the skin, said electrostatic attracting and retaining means consisting of an electrostatically charged material with a surface tension of less than 30 dynes per centimeter.
Claim 3
Dependent Claim
16 words
Device according to claim 1, wherein said printing stamp is made of natural or synthetic resin.
Claim 4
Dependent Claim
16 words
Device according to claim 2, wherein said printing stamp is made of an acrylic resin polymer.
Claim 5
Dependent Claim
29 words
Device according to claim 1, wherein said printing stamp is made of a material which can be electrostatically charged to a value between 100 and 200 volts per cm.
Claim 6
Dependent Claim
13 words
Device according to claim 2, wherein said printing stamp has a black color.
Claim 7
Dependent Claim
19 words
Device according to claim 1, wherein said printing stamp has a working surface area of at least 4 cm2.
Claim 8
Dependent Claim
17 words
Device according to claim 1, wherein the working surface of said printing stamp is flat and circular.
Claim 9
Dependent Claim
15 words
Device according to claim 1, wherein the working surface of said printing stamp is curved.
Claim 10
Dependent Claim
45 words
Device according to claim 1, wherein four said printing stamps are contained in a print carrier consisting of high dielectric material to preserve any electrostatic charge on said stamp working surface, the print carrier being provided with corresponding recesses adapted to receive said printing stamps.
Claim 11
Dependent Claim
37 words
Device according to claim 9, wherein a supporting shoulder is provided around the side edge of the bottom of each said recess for supporting said printing stamps out of contact with the bottom surface of said recess.
Claim 12
Dependent Claim
81 words
Method for determining skin type on the basis of the sebum content of the skin of certain type groups, comprising charging an electrostatically chargeable imprinting surface, having a surface tension of less than 30 dynes per centimeter, then contacting a skin area with said charged imprinting surface to obtain a sebum imprint on said skin area on said imprinting surface, and examining said imprint on said imprinting surface by comparison criteria to assign it to one of the specified type groups.
Claim 13
Dependent Claim
81 words
Method for determining skin type on the basis of the sebum content of the skin of certain type groups, comprising charging an electrostatically chargeable imprinting surface, having a surface tension of less than 30 dynes per centimeter, then contacting a skin area with said charged imprinting surface to obtain a sebum imprint on said skin area on said imprinting surface, and examining said imprint on said imprinting surface by comparison criteria to assign it to one of the specified type groups.
Claim 14
Dependent Claim
26 words
Method according to claim 11, wherein one said imprint is made each from the forehead, chin and both cheeks for determination of the facial skin type.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |