Patent US4258644A successfully refreshed from Google Patents.
US4258644A
Expired / Lapsed
US
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Depositing latent fingerprints and development thereof
Assignee: 3M Co
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Filing: 1979-07-23
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Granted: 1981-03-31
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Expires: 1999-07-23
Abstract
Abstract Latent fingerprints having a latency of several weeks are applied to paper substrates using compositions comprising trimeric aliphatic acids of at least 30 carbon atoms which are substantive to paper fibers are substantially non-volatile, and are non-hardening, non-toxic and non-hygroscopic. The latent fingerprints are developed as desired by dusting in the conventional manner with toner particles, suitably, comprising magnetic particles in oleophilic matrix.
Inventors
- 👤 Edward J. Goettert
- 👤 George V. D. Tiers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:35
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A fingerprinting pad consisting essentially of an absorbent pad at least partly saturated with a composition comprising polymeric acid of the general formula (C n H 2n-x CO 2 H) y where n is from 10 to 20, x is 1, 3 or 5 and y is 2 to 4 inclusive, wherein said composition moistens a finger upon contact of said finger with said pad.
Claim 2
Dependent Claim
65 words
A fingerprinting pad consisting essentially of an absorbent pad at least partly saturated with a composition comprising polymeric acid of the general formula (C n H 2n-x CO 2 H) y where n is from 10 to 20, x is 1, 3 or 5 and y is 2 to 4 inclusive, wherein said composition moistens a finger upon contact of said finger with said pad.
Claim 3
Dependent Claim
24 words
The fingerprinting pad according to claim 1 wherein the trimeric acid is of the formula (C 17 H 31 CO 2 H) 3 .
Claim 4
Dependent Claim
39 words
A fingerprinting pad comprising an absorbent pad impregnated with a composition comprising a non-hardenable, substantially non-volatilizable, non-hygroscopic, non-toxic higher fatty polybasic acid substantive to paper, wherein said composition moistens a finger upon contact of said finger with said pad.
Claim 5
Dependent Claim
39 words
A fingerprinting pad comprising an absorbent pad impregnated with a composition comprising a non-hardenable, substantially non-volatilizable, non-hygroscopic, non-toxic higher fatty polybasic acid substantive to paper, wherein said composition moistens a finger upon contact of said finger with said pad.
Claim 6
Dependent Claim
13 words
A fingerprinting pad according to claim 3 wherein said absorbent pad comprises paper.
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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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |