Patent EP0943466A2 successfully refreshed from Google Patents.
Patent US4381922A successfully refreshed from Google Patents.
US4381922A
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US
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Combustion detecting device using metallo-phthalocynine semiconductor and process of preparing same
Assignee: Individual
•
Filing: 1981-04-28
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Granted: 1983-05-03
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Expires: 2001-04-28
Abstract
Abstract A device for detecting combustion products and effects resulting from combustion is made by preparing a composition of metallo-phthalocyanine in amorphous or crystaline form selected from the group of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc, CuPc-CCl 4 where Pc represents phthalocyanine, mixing the metallo-phthalocyanine in powder form with a carbon-containing solvent and allowing it to remain in the solvent for a period of time to modify its initial phthalocyanine molecule, stirring the mixture to provide a suspension of the modified composition in the solvent, applying a thin uniform coating of such suspension in a selected pattern on an insulating substrate and drying the coating to form a resistance element having a resistance between 10 6 ohms and 10 10 ohms. Electrical contacts are provided for connecting such resistance element into an electrical circuit for measuring its electrical resistance and thereby detecting change of electrical resistance produced by exposure to combustion products and effects resulting from combustion.
Inventors
- 👤 Yvan A. R. Frey
- 👤 Andre P. Z. De Haan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:39
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/125; G01N27/126; G08; G08B; G08B17/00; G08B17/10; G08B17/117
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
216 words
Process of making a device for detecting combustion products and effects resulting from combustion which comprises: preparing a composition of metallo-phthalocyanine, in amorphous or crystalline form, selected from the group consisting of Fe II Pc, Fe III Pc, Cu II Pc, CuPc-CCl 4 where Pc represents phthalocyanine, mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule and stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on an insulating substrate and drying said coating to form a resistance-element having a resistance of 10 6 ohms to 10 10 ohms, and providing electrical contacts for connecting said resistance element in an electrical circuit for measuring the electrical resistance of said resistance element and thereby detecting change in electrical resistance produced by exposure to combustion products and effects resulting from combustion, a finely ground buffer selected from the group consisting of silicagel and a molecular sieve being saturated with water and mixed with said metallo-phthalocyanine composition before said composition is applied to said substrate.
Claim 2
Dependent Claim
216 words
Process of making a device for detecting combustion products and effects resulting from combustion which comprises: preparing a composition of metallo-phthalocyanine, in amorphous or crystalline form, selected from the group consisting of Fe II Pc, Fe III Pc, Cu II Pc, CuPc-CCl 4 where Pc represents phthalocyanine, mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule and stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on an insulating substrate and drying said coating to form a resistance-element having a resistance of 10 6 ohms to 10 10 ohms, and providing electrical contacts for connecting said resistance element in an electrical circuit for measuring the electrical resistance of said resistance element and thereby detecting change in electrical resistance produced by exposure to combustion products and effects resulting from combustion, a finely ground buffer selected from the group consisting of silicagel and a molecular sieve being saturated with water and mixed with said metallo-phthalocyanine composition before said composition is applied to said substrate.
Claim 3
Dependent Claim
30 words
A process according to claim 1, in which the phthalocyanine molecule of said composition is modified by replacing one or more carbon atoms in each peripheral benzene ring by nitrogen.
Claim 4
Dependent Claim
33 words
A process according to claim 1, in which the phthalocyanine molecule of said composition is modified by adding a coordinating group selected from the group consisting of chloranil, pyridine, tetracyano-quinodimethane, paraphenylene and diamine.
Claim 5
Dependent Claim
26 words
A process according to claim 1, 2, or 3, in which the resistance of said composition is modified by mixing two or more of said metallo-phthalocyanines.
Claim 6
Dependent Claim
39 words
A process according to claim 1, in which said phthalocyanine composition is applied to said substrate by sublimation in a vacuum at a temperature between 350° C. and 400° C. and pressure between 10 -4 and 10 -2 mmHg.
Claim 7
Dependent Claim
21 words
A process according to claim 1, in which the electrical resistance of said coating is modified by the application of heat.
Claim 8
Dependent Claim
31 words
A process according to claim 1, in which the electrical resistance of said coating is modified by the application of pressure in the range between 2 and 10 tons/cm 2 .
Claim 9
Dependent Claim
24 words
A process according to claim 1, in which the electrical resistance of said coating is modified by exposure of said coating to infra-red radiation.
Claim 10
Dependent Claim
35 words
A process according to claim 1, in which said solvent is carbon tetrachloride and in which said phthalocyanine composition is allowed to remain in said solvent for a period of the order of 24 hours.
Claim 11
Independent Claim
224 words
A device for detecting combustion products and effects resulting from combustion which comprises an insulating substrate, spaced conducting electrodes deposited on said substrate and a thin uniform coating of an amphorphous or crystalline metallo-phthalocyanine composition deposited on said substrated between said electrodes, said composition being selected from the group consisting of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc and CuPc-CCl 4 where Pc represents phthalocyanine, said coating being prepared by mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule, stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on said insulating substrate and drying said coating to form on said substrate a resistance element having a resistance of 10 6 ohms to 10 11 ohms, said substrate having a resistance at least 10 times that of said resistance element, a finely ground buffer selected from the group consisting of silicagel and a molecular sieve being saturated with water and mixed with said metallo-phthalocyanine composition before said composition before said composition is applied to said substrate.
Claim 12
Independent Claim
224 words
A device for detecting combustion products and effects resulting from combustion which comprises an insulating substrate, spaced conducting electrodes deposited on said substrate and a thin uniform coating of an amphorphous or crystalline metallo-phthalocyanine composition deposited on said substrated between said electrodes, said composition being selected from the group consisting of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc and CuPc-CCl 4 where Pc represents phthalocyanine, said coating being prepared by mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule, stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on said insulating substrate and drying said coating to form on said substrate a resistance element having a resistance of 10 6 ohms to 10 11 ohms, said substrate having a resistance at least 10 times that of said resistance element, a finely ground buffer selected from the group consisting of silicagel and a molecular sieve being saturated with water and mixed with said metallo-phthalocyanine composition before said composition before said composition is applied to said substrate.
Claim 13
Dependent Claim
54 words
A combustion detection device according to claim 10, comprising two of said resistance elements mounted adjacent one another on a base, one of said resistance elements being exposed directly to the atmosphere and the other of said resistance elements being covered with a transparent cover having an aperture affording restricted communication with the atmosphere.
Claim 14
Dependent Claim
30 words
A combustion detecting device according to claim 10, in which said substrate comprises alumina covered with a very thin layer of glass having a melting point of about 550° C.
Claim 15
Dependent Claim
26 words
A combustion detecting device according to claim 10 or 12, in which said electrodes comprise silver-palladium alloy annealed on said substrate and electrochemically plated with gold.
Claim 16
Dependent Claim
214 words
Process of making a device for detecting combustion products and effects resulting from combustion which comprises: preparing a composition of metallo-phthalocyanine, in amorphous or crystalline form, selected from the group consisting of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc, CuPc-CCl 4 where Pc represents the monomeric phthalocyanine group, mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule and stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on an insulating substrated and drying said coating to form a resistance-element having a resistance of 10 6 ohms to 10 10 ohms, and providing electrical contacts for connecting said resistance element in an electrical circuit for measuring the electrical resistance of said resistance element and thereby detecting change in electrical resistance produced by exposure to combustion products and effects resulting from combustion, a finely ground molecular sieve being introducted into the mixture of said metallo-phthalocyanine and carbon-containing solvent to reduce sensitivity of the device to atmospheric pressure.
Claim 17
Dependent Claim
214 words
Process of making a device for detecting combustion products and effects resulting from combustion which comprises: preparing a composition of metallo-phthalocyanine, in amorphous or crystalline form, selected from the group consisting of Fe II Pc, Fe III Pc, Ni II Pc, Cu II Pc, CuPc-CCl 4 where Pc represents the monomeric phthalocyanine group, mixing said metallo-phthalocyanine composition in powder form with a carbon-containing liquid solvent selected from the group consisting of carbon tetrachloride, ether and acetone, allowing said metallo-phthalocyanine composition to remain in said solvent for a period of time to modify its initial phthalocyanine molecule and stirring said mixture to obtain a homogeneous suspension of the modified metallo-phthalocyanine composition powder in said solvent, applying a thin uniform coating of said suspension in a selected pattern on an insulating substrated and drying said coating to form a resistance-element having a resistance of 10 6 ohms to 10 10 ohms, and providing electrical contacts for connecting said resistance element in an electrical circuit for measuring the electrical resistance of said resistance element and thereby detecting change in electrical resistance produced by exposure to combustion products and effects resulting from combustion, a finely ground molecular sieve being introducted into the mixture of said metallo-phthalocyanine and carbon-containing solvent to reduce sensitivity of the device to atmospheric pressure.
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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) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |