Patent US4313393A successfully refreshed from Google Patents.
US4313393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicator device for detecting the amount of sebum in hair and scalp and method therefor
Assignee: Dail Corp
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Filing: 1978-09-19
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Granted: 1982-02-02
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Expires: 1998-09-19
Abstract
Abstract An indicating device for determining the dry, normal or oily characteristics of human hair and scalp. More particularly, an indicating device comprising an oil absorbent indicating material, treated with an oil-soluble dye, surrounded by an oil permeable membrane. The invention additionally relates to a method for determining the dry, normal or oily characteristics of the hair and scalp.
Inventors
- 👤 Frank D. Barbuscio
- 👤 LeRoy Hunter
- 👤 Joseph C. Hourihan
- 👤 Mary C. Inglis
- 👤 Helen E. Oberstar
- 👤 Hosny Saad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:32
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/44; A61B5/441; A61B5/446; A61B10/00; A61B10/0045; A61B10/0064; A61B5/42; A61B5/4261; A61B5/4272; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/521
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
An indicator device for contact with human hair or scalp for determining the oiliness thereof, comprising (a) an oil-absorbent sheet material capable of absorbing sebum from the hair and scalp, said oil-absorbing sheet material being dyed on a surface with (b) an oil-soluble dye, soluble in sebum, capable of giving a visual physical color change in the area when placed in contact with sebum to form a spot of differing color when the dye dissolves the sebum of a size proportional to the amount of sebum absorbed by the oil-absorbing material, and (c) a non-adhering oil-permeable transparent sheet material permeable to said sebum adjacent to and superimposed over said dyed surface, said oil-permeable sheet forming part of an envelope enclosing said dyed oil-absorbent sheet, and allowing passage of sebum when brought into contact with sebum, whereby said sebum is absorbed by said absorbent sheet material to effect said visual physical color change which is visible through said transparent envelope surface.
Claim 2
Dependent Claim
160 words
An indicator device for contact with human hair or scalp for determining the oiliness thereof, comprising (a) an oil-absorbent sheet material capable of absorbing sebum from the hair and scalp, said oil-absorbing sheet material being dyed on a surface with (b) an oil-soluble dye, soluble in sebum, capable of giving a visual physical color change in the area when placed in contact with sebum to form a spot of differing color when the dye dissolves the sebum of a size proportional to the amount of sebum absorbed by the oil-absorbing material, and (c) a non-adhering oil-permeable transparent sheet material permeable to said sebum adjacent to and superimposed over said dyed surface, said oil-permeable sheet forming part of an envelope enclosing said dyed oil-absorbent sheet, and allowing passage of sebum when brought into contact with sebum, whereby said sebum is absorbed by said absorbent sheet material to effect said visual physical color change which is visible through said transparent envelope surface.
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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) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |