Patent US5605734A successfully refreshed from Google Patents.
US5605734A
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Phosphorescent directional signals and manufacturing method
Assignee: BASF Corp
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Filing: 1993-03-19
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Granted: 1997-02-25
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Expires: 2013-03-19
Abstract
Abstract Claimed are a method of making a direction indicating carpet, useful in temporarily unlighted building hallways and rooms. Symbols are tufted into the carpet using zinc sulfide copper activated pigments in concentration of 2% in the fiber.
Inventors
- 👤 Ling Yeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:25
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/04; C; C09; C09K; C09K11/00; C09K11/02; C09K11/08; C09K11/58; C09K11/582; C09K11/584; D01F6/00; D01F6/58; D01F6/60; D06; D06N; D06N7/00; D06N7/0005; D06N7/0028; D06N7/0039; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23929; Y10T428/23936; Y10T428/23993; Y10T428/29; Y10T428/2904; Y10T428/2913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A tufted carpet having phosphorescent directional indicia formed in an area of the carpet which experiences low or no traffic when installed, said carpet comprising a backing, directional yarn tufts comprised of melt-spun, draw-textured phosphorescent fibers which are tufted into that portion of the carpet backing corresponding to said directional indicia so as to form said directional indicia in said low or no traffic area of the carpet, and colored yarn tufts comprised of non-phosphorescent colored fibers which are tufted into a remaining portion of said backing surrounding the phosphorescent directional indicia, wherein said phosphorescent fibers of said directional tufts are melt-spun with a zinc sulfide copper activated pigment such that said pigment is dispersed within said phosphorescent fibers.
Claim 2
Dependent Claim
119 words
A tufted carpet having phosphorescent directional indicia formed in an area of the carpet which experiences low or no traffic when installed, said carpet comprising a backing, directional yarn tufts comprised of melt-spun, draw-textured phosphorescent fibers which are tufted into that portion of the carpet backing corresponding to said directional indicia so as to form said directional indicia in said low or no traffic area of the carpet, and colored yarn tufts comprised of non-phosphorescent colored fibers which are tufted into a remaining portion of said backing surrounding the phosphorescent directional indicia, wherein said phosphorescent fibers of said directional tufts are melt-spun with a zinc sulfide copper activated pigment such that said pigment is dispersed within said phosphorescent fibers.
Claim 3
Dependent Claim
38 words
The carpet of claim 1, wherein the colored fibers of said colored yarn tufts have a color which is similar in color to the phosphorescent directional indicia sufficient to render the phosphorescent directional indicia inconspicuous in natural light.
Claim 4
Dependent Claim
38 words
The carpet of claim 1, wherein the colored fibers of said colored yarn tufts have a color which is dissimilar in color to the phosphorescent directional indicia sufficient to render the phosphorescent directional indicia conspicuous in natural light.
Claim 5
Dependent Claim
26 words
The carpet of claim 1 wherein said phosphorescent fibers have a phosphorescent pigment concentration of between about 2 and about 10 percent by weight in fiber.
Claim 6
Dependent Claim
31 words
The carpet of claim 1, wherein the phosphorescent directional indicia are positioned in a low or no traffic area of the carpet which is within 12" of a wall when installed.
Claim 7
Dependent Claim
16 words
The carpet of claim 1, wherein the phosphorescent fibers of said directional yarn tufts are undyed.
Claim 8
Dependent Claim
17 words
The carpet of claim 1, wherein the phosphorescent fibers of said directional yarn tufts are transparent dyed.
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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) | 2000-02-25 | 2000-08-26 | 2001-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-25 | 2004-08-26 | 2005-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-25 | 2008-08-26 | 2009-02-25 | $7700.00 | Window Closed / Lapsed |