US3867165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recording fingerprints
Assignee: RCA Corp
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Filing: 1973-09-21
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Granted: 1975-02-18
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Expires: 1993-09-21
Abstract
Abstract A method of recording fingerprints whereby the finger is coated with a reducing agent, electro-oxidation products are generated on the ridges of the finger and the finger contacted with a recording substrate containing an indicator for the electrooxidation products.
Inventors
- 👤 Richard Williams
- 👤 Alfred Henry Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:32
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A METHOD OF RECORDING PRINTS OF THE BODY EXTREMITIES WHICH COMPRISES A. COATING THE EXTREMITY TO BE RECORDED WITH A REDUCING AGENT, B. PASSING A CURRENT THROUGH THE REDUCING AGENT-COATING SO AS TO GENERATE ELECTRO-OXIDATION PRODUCTS ON THE COATED EXTERMITY AND C. CONTACTING THE EXTREMITY WITH A RECORDING MEDIUM CONTAINING AN INDICATOR FOR THE ELECTRO-OXIDATION PRODUCTS TO FORM A PERMANENT IMAGE OF SAID EXTREMITY ON SAID RECORDING MEDIUM.
Claim 2
Independent Claim
68 words
A METHOD OF RECORDING PRINTS OF THE BODY EXTREMITIES WHICH COMPRISES A. COATING THE EXTREMITY TO BE RECORDED WITH A REDUCING AGENT, B. PASSING A CURRENT THROUGH THE REDUCING AGENT-COATING SO AS TO GENERATE ELECTRO-OXIDATION PRODUCTS ON THE COATED EXTERMITY AND C. CONTACTING THE EXTREMITY WITH A RECORDING MEDIUM CONTAINING AN INDICATOR FOR THE ELECTRO-OXIDATION PRODUCTS TO FORM A PERMANENT IMAGE OF SAID EXTREMITY ON SAID RECORDING MEDIUM.
Claim 3
Dependent Claim
13 words
A method according to claim 1 wherein the reducing agent is potassium iodide.
Claim 4
Dependent Claim
13 words
A method according to claim 2 wherein the recording medium is untreated paper.
Claim 5
Independent Claim
103 words
A METHOD OF RECORDING FINGERPRINTS WHICH COMPRISES A. COATING ONE OR MORE FINGERS TO BE PRINTED WITH A SOLUTION CONTAINING POTASSIUM IODIDE, B. PRESSING THE COATED FINGER OR FINGERS ONTO A CONDUCTIVE SUBSTRATE CONNECTED TO THE POSITIVE SIDE OF A DIRECT CURRENT POWER SOURCE, C. PLACING ANOTHER FINGER OR FINGERS ON A SECOND CONDUCTIVE SUBSTRATE CONNECTED TO THE NEGATIVE SIDE OF THE POWER SOURCE, THEREBY GENERATING FREE IODINE ON THE SURFACE OF THE FINGER OR FINGERS TO BE PRINTED, AND D. CONTACTING THE FINGER OR FINGERS TO BE PRINTED ONTO A STARCH-CONTAINING RECORDING MEDIUM TO FORM A PERMANENT FINGERPRINT ON SAID RECORDING MEDIUM.
Claim 6
Independent Claim
103 words
A METHOD OF RECORDING FINGERPRINTS WHICH COMPRISES A. COATING ONE OR MORE FINGERS TO BE PRINTED WITH A SOLUTION CONTAINING POTASSIUM IODIDE, B. PRESSING THE COATED FINGER OR FINGERS ONTO A CONDUCTIVE SUBSTRATE CONNECTED TO THE POSITIVE SIDE OF A DIRECT CURRENT POWER SOURCE, C. PLACING ANOTHER FINGER OR FINGERS ON A SECOND CONDUCTIVE SUBSTRATE CONNECTED TO THE NEGATIVE SIDE OF THE POWER SOURCE, THEREBY GENERATING FREE IODINE ON THE SURFACE OF THE FINGER OR FINGERS TO BE PRINTED, AND D. CONTACTING THE FINGER OR FINGERS TO BE PRINTED ONTO A STARCH-CONTAINING RECORDING MEDIUM TO FORM A PERMANENT FINGERPRINT ON SAID RECORDING MEDIUM.
Claim 7
Dependent Claim
13 words
A method according to claim 4 wherein the recording medium is untreated paper.
Claim 8
Dependent Claim
20 words
A method according to claim 4 wherein the direct current power source delivers about 0.5 millicoulombs charge to the finger.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |