US3619154A
Expired / Lapsed
US
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Infrared sensitization of photoconductive compositions employing cyanine dyes
Assignee: Westvaco Corp
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Filing: 1968-07-30
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Granted: 1971-11-09
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Expires: 1988-07-30
Abstract
Abstract Photoconductive compositions comprising zinc oxide are sensitized in the near infrared region of the spectrum by near infrared-sensitizing cyanine dyes. The dyes adsorb onto the surface of zinc oxide and render it photosensitive to wavelengths of light above 700 millimicrons.
Inventors
- 👤 Giancarlo A Cavagna
- 👤 Asa Leifer
- 👤 Fredric N Miller
- 👤 Frederick J Vermillion Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:15
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/09; G03G5/06; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
26 words
A photoconductive composition as defined in claim 5 in which the near infrared-sensitizing cyanine dye is an anhydronium base of the dyes defined in claim 1.
Claim 2
Dependent Claim
24 words
A photoconductive composition as defined in claim 1 in which the near infrared-sensitizing cyanine dye is (2-bis (3 omega -carboxyethyl bezothiazolyl) heptamethine cyanine iodide.
Claim 3
Dependent Claim
23 words
A photoconductive composition as defined in claim 1 in which the near infrared sensitizing cyanine dye is (2-bis(3- omega -sulfopropyl benzothiazolyl)) heptamethine cyanine.
Claim 4
Dependent Claim
24 words
A photoconductive composition as defined in claim 1 in which the near infrared-sensitizing cyanine dye is (2-bis (3- omega -sulfopropyl Beta -naphthothiazolyl)) heptamethine cyanine.
Claim 5
Dependent Claim
27 words
A photoconductive composition as defined in claim 1 in which the near infrared-sensitizing cyanine dye renders the zinc oxide photosensitive to wavelengths of light above 700 millimicrons.
Claim 6
Dependent Claim
52 words
The process of producing a photoconductive composition which photosensitive in the near infrared region of the spectrum which comprises the step of mixing photoconductive zinc oxide with a high dielectric insulator binder, and add to the mixture a near infrared-sensitizing cyanine dye selected from those dyes reprEsented by the following general formula:
Claim 7
Dependent Claim
22 words
The process of claim 7 in which the near infrared-sensitizing cyanine dye is an anhydronium base of dyes defined in claim 7.
Claim 8
Dependent Claim
21 words
The process of claim 7 in which the near infrared-sensitizing cyanine dye is (2-bis (3- omega -carboxyethyl benzothiazolyl)) heptamethine cyanine iodide.
Claim 9
Dependent Claim
20 words
The process of claim 7 in which the near infrared-sensitizing cyanine dye is (2-bis (3- omega -sulfopropyl benzothiazolyl)) heptamethine cyanine.
Claim 10
Dependent Claim
21 words
The process of claim 7 in which the near infrared-sensitizing cyanine dye is (2-bis (3- omega -sulfopropyl Beta -naphthothiazolyl)) heptamethine cyanine.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |