Patent US3923938A successfully refreshed from Google Patents.
US3923938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing a pile covering
Assignee: SERPO NV
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Filing: 1972-11-08
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Granted: 1975-12-02
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Expires: 1992-11-08
Abstract
Abstract The invention pertains to a method for manufacturing a pile covering, wherein a foam layer, preferably of polyurethane, is continuously produced by spraying a reacting mixture on a supporting layer, pile fibres being projected on said foam layer prior to the hardening thereof, a covering being thus obtained comprising a layer of foam, a skin on the upper face of said layer and pile fibres implanted onto and through said skin.
Inventors
- 👤 Willy Poppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:54
CPC Classifications
D; D04; D04H; D04H11/00; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/2395; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A PROCESS FOR MANUFACTURING A PILE COVERING WHICH COMPRISES SHAPING A SUPPORT INTO A CYLINDER, APPLYING TO SAID CYLINDRICALLY-SHAPED SUPPORT FROM OUTSIDE SAID CYLINDRICAL SUPPORT AND ONTO SAID CYCLINDRICAL SUPPORT ALONG THE FULL CIRCUMFERENCE OF SAID SUPPORT, A LAYER OF A FOAM-FORMING POLYURETHANE REACTION MIXTURE, CONVERTING SAID COATED CYCLINDRICALLY SHAPED SUPPORTING LAYER INTO A FLAT SURFACE, IMPLANTING PILE FIBERS INTO THE COATED FOAMED LAYER BEFORE SAID LAYER HAS COMPLETELY HARDENED, SAID FIBERS BEING IMPLANTED BY ELECTROSTATIC FLOCKING, ALLOWING SAID FLOCKED LAYER TO CURE, APPLYING SUCTION THERETO TO REMOVE ANY LOOSE FIBERS THEREFROM, AND SEPARATING SAID FOAMED FIBER FLOCKED LAYER FROM SAID SUPPORT.
Claim 2
Dependent Claim
102 words
A PROCESS FOR MANUFACTURING A PILE COVERING WHICH COMPRISES SHAPING A SUPPORT INTO A CYLINDER, APPLYING TO SAID CYLINDRICALLY-SHAPED SUPPORT FROM OUTSIDE SAID CYLINDRICAL SUPPORT AND ONTO SAID CYCLINDRICAL SUPPORT ALONG THE FULL CIRCUMFERENCE OF SAID SUPPORT, A LAYER OF A FOAM-FORMING POLYURETHANE REACTION MIXTURE, CONVERTING SAID COATED CYCLINDRICALLY SHAPED SUPPORTING LAYER INTO A FLAT SURFACE, IMPLANTING PILE FIBERS INTO THE COATED FOAMED LAYER BEFORE SAID LAYER HAS COMPLETELY HARDENED, SAID FIBERS BEING IMPLANTED BY ELECTROSTATIC FLOCKING, ALLOWING SAID FLOCKED LAYER TO CURE, APPLYING SUCTION THERETO TO REMOVE ANY LOOSE FIBERS THEREFROM, AND SEPARATING SAID FOAMED FIBER FLOCKED LAYER FROM SAID SUPPORT.
Claim 3
Dependent Claim
24 words
The process of claim 1 which further comprises applying an open mesh fabric onto the building up foam layer which is subsequently foamed in.
Claim 4
Dependent Claim
15 words
The process of claim 1 which further comprises placing a nEtwork under the foamed layer.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the reacting mixture is electrostatically projected onto the cylindrically shaped supporting layer.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |