US4526803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparentizing
Assignee: Baxter International Inc
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Filing: 1983-06-20
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Granted: 1985-07-02
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Expires: 2003-06-20
Abstract
Abstract A generally non-transparent substrate is rendered substantially transparent, for example at a particular location or locations thereon, by electrostatically depositing finely divided transparentizing particles onto the substrate and then heating those particles to facilitate their flow into the intersticies of the substrate. The transparentizing particles have an optical refractive index that is substantially the same as that of the substrate, and these transparentizing particles have a melting point greater than that encountered during handling and storage and less than the temperature at which the substrate would be damaged.
Inventors
- 👤 Leonard A. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:23
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/26; B; B05; B05B; B05B5/00; B05B5/08; D21H19/00; Y; Y10; Y10S; Y10S428/00; Y10S428/918
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
A method for electrostatically transparentizing a portion of a substrate, comprising: selecting finely divided, electrostatically chargeable particles of a material having transparentizing characteristics for a preselected substrate; electrostatically depositing said finely divided transparentizing particles onto a predetermined area of the substrate; heating the transparentizing particles to form a molten transparentizing material at the predetermined area; and transparentizing the substrate at the predetermined area by flowing the molten transparentizing material into the substrate at the predetermined area and allowing the material to solidify therein to form a substrate having a transparentized area and an opaque area.
Claim 2
Independent Claim
95 words
A method for electrostatically transparentizing a portion of a substrate, comprising: selecting finely divided, electrostatically chargeable particles of a material having transparentizing characteristics for a preselected substrate; electrostatically depositing said finely divided transparentizing particles onto a predetermined area of the substrate; heating the transparentizing particles to form a molten transparentizing material at the predetermined area; and transparentizing the substrate at the predetermined area by flowing the molten transparentizing material into the substrate at the predetermined area and allowing the material to solidify therein to form a substrate having a transparentized area and an opaque area.
Claim 3
Dependent Claim
50 words
The method of claim 1, wherein said selecting step includes choosing the transparentizing material to have a refractive index approximately the same as that of the substrate and to have a melting temperature that is greater than ambient temperature and less than a temperature at which the substrate is damaged.
Claim 4
Dependent Claim
51 words
The method of claim 1, wherein said electrostatically depositing step includes electrostatically depositing the transparentizing particles onto a section of an endless surface having a reusable continuous loop, contacting the substrate with said section of the reusable continuous loop, and transferring at least some of the transparentizing particles onto the substrate.
Claim 5
Dependent Claim
21 words
The method of claim 1, further including forming the substrate having the transparentized area into a container having a transparentized area.
Claim 6
Dependent Claim
34 words
The method of claim 1, wherein said electrostatic depositing step includes electrostatically depositing the transparentizing particles in a pattern onto an endless surface, and wherein said transparentizing step includes applying pressure to the pattern.
Claim 7
Dependent Claim
43 words
The method of claim 1, wherein said electrostatic depositing step includes depositing the transparentizing particles generally uniformly onto an endless surface, and wherein said transparentizing step includes applying pressure to the transparentizing material by contacting same with raised portions of a stamping platen.
Claim 8
Dependent Claim
45 words
The method of claim 1, wherein said electrostatic depositing step is carried out from one side of the substrate at the predetermined area, and further including another electrostatic depositing step that is carried out from the other side of the substrate at the predetermined area.
Claim 9
Dependent Claim
18 words
The method of claim 1, wherein said selecting step includes choosing a transparentizing material that is substantially transparent.
Claim 10
Dependent Claim
25 words
The method of claim 1, wherein said selecting step includes choosing a transparentizing material that has a refractive index of between about 1.3 and 1.7.
Claim 11
Dependent Claim
17 words
The method of claim 1, wherein said selecting step includes choosing finely divided particles that are dielectric.
Claim 12
Dependent Claim
36 words
The method of claim 1, wherein said selecting step includes choosing a transparentizing material that has a refractive index of not more than about ±0.02 refractive index units different from the refractive index of the substrate.
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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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |