Patent US3519808A successfully refreshed from Google Patents.
US4028876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for visually indicating elapsed time by a color change
Assignee: Lawrence Peska Associates Inc
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Filing: 1976-03-05
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Granted: 1977-06-14
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Expires: 1996-03-05
Abstract
Abstract Apparatus for visually indicating elapsed time by a color change is disclosed comprising a first and second chromophoric compound that are combined with one another through a matrix which controls the rate of combination of the compounds so that a color body is produced by the reaction of the compounds over a period of time that may be adjustable from anywhere from about one to about thirty days. The device comprises a transparent container having a rupturable capsule therein in which the first composition is contained. A transparent matrix surrounding the second composition is also in the container. The device may be secured to a surface by means of a mechanical fastener or an adhesive layer.
Inventors
- 👤 Jorge M. Delatorre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:29
CPC Classifications
G; G04; G04F; G04F1/00; G04F1/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
Apparatus for visual indication of elapsed time by a color change comprising a transparent flexible enclosed receptacle means having a ruptureable sealed container therein, a first fluid chromophoric compound in said container, second chromophoric compound enclosed in a transparent organic film matrix within said receptacle, said first compound and said second compound comprising reactants that form a color body when contacted with one another, said organic film matrix being permeable by said first compound.
Claim 2
Dependent Claim
74 words
Apparatus for visual indication of elapsed time by a color change comprising a transparent flexible enclosed receptacle means having a ruptureable sealed container therein, a first fluid chromophoric compound in said container, second chromophoric compound enclosed in a transparent organic film matrix within said receptacle, said first compound and said second compound comprising reactants that form a color body when contacted with one another, said organic film matrix being permeable by said first compound.
Claim 3
Dependent Claim
14 words
The device of claim 1 where said organic film matrix comprises a plastic composition.
Claim 4
Dependent Claim
21 words
The device of claim 1 where said second compound is combined with a material for the sorption of said first compound.
Claim 5
Dependent Claim
15 words
The device of claim 1 further comprising means for securing said receptacle to a surface.
Claim 6
Dependent Claim
18 words
The device of claim 4 where said means for securing said receptacle to a surface comprises an adhesive.
Claim 7
Dependent Claim
77 words
Apparatus for visual indication of elapsed time by a color change comprising a transparent flexible enclosed receptacle means having a ruptureable sealed container therein, a first chromophoric compound in said container, second chromophoric compound enclosed in a transparent matrix within said receptacle, said first compound and said second compound comprising reactants that form a color body when contacted with one another, said matrix being permeable by said first compound said second compound being micro-encapsulated in said matrix.
Claim 8
Dependent Claim
77 words
Apparatus for visual indication of elapsed time by a color change comprising a transparent flexible enclosed receptacle means having a ruptureable sealed container therein, a first chromophoric compound in said container, second chromophoric compound enclosed in a transparent matrix within said receptacle, said first compound and said second compound comprising reactants that form a color body when contacted with one another, said matrix being permeable by said first compound said second compound being micro-encapsulated in said matrix.
Claim 9
Dependent Claim
128 words
Apparatus for visual indication of elapsed time by a color change comprising a transparent flexible enclosed receptacle means having a ruptureable sealed container therein, a first chromophoric compound in said container, second chromophoric compound enclosed in a transparent matrix within said receptacle, said first compound and said compound comprising reactants that form a color body when contacted with one another, said matrix being permeable by said first compound, a plurality of color comparator means on the exterior of said receptacle corresponding in color to the color body produced by the combination of the first and second chromophoric compound, said color comparators increasing in tone from a light color to the color represented by the complete reaction of said first and second chromophoric compounds to form the color body.
Claim 10
Dependent Claim
128 words
Apparatus for visual indication of elapsed time by a color change comprising a transparent flexible enclosed receptacle means having a ruptureable sealed container therein, a first chromophoric compound in said container, second chromophoric compound enclosed in a transparent matrix within said receptacle, said first compound and said compound comprising reactants that form a color body when contacted with one another, said matrix being permeable by said first compound, a plurality of color comparator means on the exterior of said receptacle corresponding in color to the color body produced by the combination of the first and second chromophoric compound, said color comparators increasing in tone from a light color to the color represented by the complete reaction of said first and second chromophoric compounds to form the color body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |