US4640035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Identifying means
Assignee: UK Secretary of State for Defence
•
Filing: 1982-08-18
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Granted: 1987-02-03
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Expires: 2002-08-18
Abstract
Abstract A particulate coding material, e.g. for identifying the origin of a product by introducing it at source without its presence being readily apparent, comprises particles formed as thin transverse sections of an assembly of elongated elements, e.g. of plastic or natural fibres, of different colors and/or compositions forming a transversely united structure, e.g. having their longitudinal surfaces in adherent contact or contained in a matrix. The assembly can be produced by combining pre-existing filaments, e.g. by twisting, or by extrusion through a die, and may be drawn-down to a desired size (e.g. 10-150 μm across) before sectioning. The resulting plurality of distinguishable areas in each particle (and, if desired, their relative locations) provide a coding facility. Larger flat bodies similarly formed, and the unsectioned elongated assemblies, also have identifying uses.
Inventors
- 👤 Stuart S. Kind
- 👤 David G. Sanger
- 👤 John D. Twibell
- 👤 John Hargraves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:05
CPC Classifications
G; G09; G09F; G09F3/00; Y; Y10; Y10S; Y10S149/00; Y10S149/123; Y10S252/00; Y10S252/965
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A particulate coding material comprising particles formed as thin transverse sections of an assembly comprising preexisting filaments twisted together and having their longitudinal surfaces in adherent contact, one with another, the individual filaments being of at least two different colors and/or compositions whereby each section has the same number of areas of each color and/or composition as every other section, wherein prior to sectioning into thin transverse sections the filaments of the assembly are transversely united only by the twist and the adherent contact, and, after sectioning, the filament sections of the particles are permanently transversely united only by said adherent contact, and wherein the assembly and the resulting particles are devoid of any surrounding cover about their exteriors.
Claim 2
Dependent Claim
119 words
A particulate coding material comprising particles formed as thin transverse sections of an assembly comprising preexisting filaments twisted together and having their longitudinal surfaces in adherent contact, one with another, the individual filaments being of at least two different colors and/or compositions whereby each section has the same number of areas of each color and/or composition as every other section, wherein prior to sectioning into thin transverse sections the filaments of the assembly are transversely united only by the twist and the adherent contact, and, after sectioning, the filament sections of the particles are permanently transversely united only by said adherent contact, and wherein the assembly and the resulting particles are devoid of any surrounding cover about their exteriors.
Claim 3
Dependent Claim
18 words
Material as claimed in claim 1 wherein the assembly comprises filaments twisted around at least one core filament.
Claim 4
Dependent Claim
18 words
Material as claimed in claim 2 comprising thinner filaments adherent to a core formed by a thicker filament.
Claim 5
Dependent Claim
34 words
Material as claimed in claim 3 formed by a process comprising the step of applying the thin filaments to the heat-softened, solvent-softened or adhesive-wetted surface of the thicker core filament to effect adhesion thereto.
Claim 6
Dependent Claim
28 words
Material as claimed in claim 1 or claim 2 formed by a process comprising the step of applying a liquid adhesive to the filaments to effect adherence therebetween.
Claim 7
Dependent Claim
20 words
Material as claimed in claim 5 wherein said adhesive is applied to the filaments after the filaments are twisted together.
Claim 8
Dependent Claim
22 words
Material as claimed in claim 1 or claim 2 wherein at least some of the filaments are made of organic plastics material.
Claim 9
Dependent Claim
25 words
Material as claimed in claim 1 or claim 2 wherein at least some of the filaments are made of inorganic plastics material or of glass.
Claim 10
Dependent Claim
19 words
Material as claimed in claim 1 or claim 2 wherein at least some of the filaments are natural fibres.
Claim 11
Dependent Claim
28 words
Material as claimed in claim 7 wherein the organic plastics material is thermoplastic polymer material and wherein adherence between adjacent filaments is by fusion of said polymer material.
Claim 12
Dependent Claim
33 words
Material as claimed in claim 10 wherein the assembly is drawn-down to a reduced cross-section from a larger one as which it is initially produced before being transversely sectioned to form said particles.
Claim 13
Dependent Claim
26 words
Material as claimed in claim 1 or 2 wherein the particles have a width in the range 10-150 μm and a thickness less than their width.
Claim 14
Dependent Claim
33 words
Material as claimed in claim 1 or 2 wherein the relative locations of the several areas within each section formed from the respective filaments of the assembly are constant for all the particles.
Claim 15
Dependent Claim
19 words
A method of identifying a product by incorporating therein particulate coding material as claimed in claim 1 or 2.
Claim 16
Dependent Claim
16 words
A particulate coding material as claimed in claim 1 wherein all of said filaments are nonmetallic.
References Cited (Backward Citations)
US951147A
Cited
US1216964A
Cited
US1822098A
Cited
US1787995A
Cited
US1738316A
Cited
US1950126A
Cited
US3964294A
Cited
GB1536192A
Cited
GB1568699A
Cited
US4198307A
Cited
US4197104A
Cited
US4390452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |