US4618167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security filament for use in identification cards
Assignee: N PETER WHITEHEAD
•
Filing: 1984-02-09
•
Granted: 1986-10-21
•
Expires: 2004-02-09
Abstract
Abstract A filament for use with identification cards to render them tamper and fraud resistant having a meltable core of twisted polymeric micro-filaments which is wrapped with metal foil in a manner to leave portions of the core exposed.
Inventors
- 👤 Edwin N. Whitehead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:12
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/12; B; B42; B42D; B42D25/00; B42D25/30; B42D25/36; B42D25/373; B42D25/20; B42D25/23; B42D25/309; B42D25/355; B42D25/40; B42D25/45; B42D25/455; B42D25/46; D02G3/22; D02G3/38; D02G3/44; D02G3/441; G; G07; G07F; G07F7/00; G07F7/08; G07F7/086; B42D2033/04; B42D2033/10; B42D2033/30; B42D2033/32; B42D2035/02; B42D2035/06; B42D2035/08; B42D2035/16; Y; Y10; Y10S; Y10S283/00; Y10S283/904; Y10S428/00; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
A security identification card, comprising (a) an indicia bearing surface, (b) a filament positioned on at least a portion of said surfce, said filament comprising a core of twisted unplasticized polyvinyl chloride microfilaments and metal foil spirally wrapped around said core to provide a substantially uniform spacing between the helicies of said spiral wrapping, (c) a clear, transparent, polymeric cover where the heat and pressure of lamination flatten said foil, melt said core and form an integral body.
Claim 2
Dependent Claim
78 words
A security identification card, comprising (a) an indicia bearing surface, (b) a filament positioned on at least a portion of said surfce, said filament comprising a core of twisted unplasticized polyvinyl chloride microfilaments and metal foil spirally wrapped around said core to provide a substantially uniform spacing between the helicies of said spiral wrapping, (c) a clear, transparent, polymeric cover where the heat and pressure of lamination flatten said foil, melt said core and form an integral body.
Claim 3
Dependent Claim
93 words
A security filament for placement on and lamination to an indicia bearing surface, comprising: polymeric microfilaments twisted together into a core, said core bearing meltable and flowable in a uniform and regular manner at conditions equivalent to approximately 121° C. (350° F.) and 500-1000 psi pressure, and malleable metal foil continuously wrapped in a spiral manner around and exposing spaced portions of said core, whereby subjecting said foil wrapped core to conditions substantially equivalent to 121° C. and 500-1000 psi pressure flattens said foil and causes said core to melt and flow uniformly.
Claim 4
Dependent Claim
93 words
A security filament for placement on and lamination to an indicia bearing surface, comprising: polymeric microfilaments twisted together into a core, said core bearing meltable and flowable in a uniform and regular manner at conditions equivalent to approximately 121° C. (350° F.) and 500-1000 psi pressure, and malleable metal foil continuously wrapped in a spiral manner around and exposing spaced portions of said core, whereby subjecting said foil wrapped core to conditions substantially equivalent to 121° C. and 500-1000 psi pressure flattens said foil and causes said core to melt and flow uniformly.
Claim 5
Dependent Claim
27 words
A security filament according to claim 2 where the diameter of said core is approximately 5 mils and the thickness of said foil is approximately 4 mils.
Claim 6
Dependent Claim
16 words
A security filament according to claim 2 where said microfilaments are composed of unplasticized polyvinyl chloride.
Claim 7
Dependent Claim
24 words
A security filament according to claim 4 where said core has a diameter of approximately 5 mils and is composed of approximately fifty microfilaments.
Claim 8
Dependent Claim
97 words
In combination: an indicia bearing surface; and a filament for positioning thereover and lamination to said surface at lamination conditions approximating 121° C. and 500-1000 psi pressure, said filament comprising a core of twisted polymeric microfilaments which melt and substantially uniformly flow at said lamination conditions and thin, metal foil strip spirally wrapped around said core in a manner where regularly spaced portions of said core are exposed whereupon exposing said filament positioned on said surface to said lamination conditions causes said foil strip to flatten and melts said core which substantially uniformly flows onto said surface.
Claim 9
Dependent Claim
97 words
In combination: an indicia bearing surface; and a filament for positioning thereover and lamination to said surface at lamination conditions approximating 121° C. and 500-1000 psi pressure, said filament comprising a core of twisted polymeric microfilaments which melt and substantially uniformly flow at said lamination conditions and thin, metal foil strip spirally wrapped around said core in a manner where regularly spaced portions of said core are exposed whereupon exposing said filament positioned on said surface to said lamination conditions causes said foil strip to flatten and melts said core which substantially uniformly flows onto said surface.
Claim 10
Dependent Claim
16 words
A combination according to claim 6 where said metal foil is 4 mil thick aluminum foil.
Claim 11
Dependent Claim
13 words
A combination according to claim 7 where said foil is anodized with gold.
Claim 12
Dependent Claim
16 words
A combination according to claim 8 where said core is composed essentially of unplasticized polyvinyl chloride.
References Cited (Backward Citations)
US2448782A
Cited
US2835993A
Cited
US3622429A
Cited
US4097279A
Cited
US4183989A
Cited
US4183989B1
Cited
US4290630A
Cited
US4371196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |