Patent US3855048A successfully refreshed from Google Patents.
US3855048A
Expired / Lapsed
US
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Foam laminates
Assignee: Caligen Foam Ltd
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Filing: 1973-01-05
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Granted: 1974-12-17
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Expires: 1993-01-05
Abstract
Abstract A process of laminating textile fabrics to opposite sides of polyurethane foam in which the lamination is effected by flame bonding under such conditions that the temperature to which the foam is raised at one side is different from that to which it is raised at the other side.
Inventors
- 👤 R Bagnall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:55
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/245; B32B27/00; B32B27/12; B32B27/40; B32B37/00; B32B37/04; B32B37/10; B32B37/1054; B32B38/00; B32B38/0036; B32B38/004; B32B5/02; B32B5/022; B32B5/024; B32B5/026; B32B5/18; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2305/00; B32B2305/02; B32B2305/022; B32B2305/10; B32B2305/18; B32B2305/186; B32B2305/188; B32B2305/20; B32B2310/00; B32B2310/04; B32B2310/0445; B32B2375/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/335; Y10T442/40; Y10T442/469; Y10T442/60; Y10T442/647; Y10T442/651
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A PROCESS OF LAMINATING CLOTH TO OPPOSITE SIDES OF POLYURETHANE FOAM, COMPRISING THE STEPS OF: A. PROVIDING A SHEET OF POLYURETHANE FOAM, B. HEATING ONE SIDE OF THE FOAM SHEET TO AT LEAST 400*C, C. PRESSING A CLOTH LAYER AGAINST SAID ONE SIDE TO LAMINATE THE CLOTH AND FOAM, D. HEATING THE OTHER SIDE OF THE FOAM SHEET TO NO HIGHER THAN 360*C AND E. PRESSING ANOTHER CLOTH LAYER AGAINST SAID OTHER SIDE OF THE FOAM TO LAMINATE THE ANOTHER CLOTH LAYER AND THE FOAM, THEREBY PRODUCING A LAMINATE COMPRISIN THE POLYURETHANE FOAM SHEET SANDWICHED BETWEEN THE TWO CLOTH LAYERS.
Claim 2
Dependent Claim
100 words
A PROCESS OF LAMINATING CLOTH TO OPPOSITE SIDES OF POLYURETHANE FOAM, COMPRISING THE STEPS OF: A. PROVIDING A SHEET OF POLYURETHANE FOAM, B. HEATING ONE SIDE OF THE FOAM SHEET TO AT LEAST 400*C, C. PRESSING A CLOTH LAYER AGAINST SAID ONE SIDE TO LAMINATE THE CLOTH AND FOAM, D. HEATING THE OTHER SIDE OF THE FOAM SHEET TO NO HIGHER THAN 360*C AND E. PRESSING ANOTHER CLOTH LAYER AGAINST SAID OTHER SIDE OF THE FOAM TO LAMINATE THE ANOTHER CLOTH LAYER AND THE FOAM, THEREBY PRODUCING A LAMINATE COMPRISIN THE POLYURETHANE FOAM SHEET SANDWICHED BETWEEN THE TWO CLOTH LAYERS.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the other side of the foam sheet is heated to no higher than 340*C.
Claim 4
Dependent Claim
53 words
A process according to claim 1 wherein the pressing of steps (c) and (e) is performed by passing the cloth and foam between nip rollers, the gap between the rollers at their point of closest spacing being between 0.6 and 0.9 times the combined thickness of cloth and foam entering between the rollers.
Claim 5
Dependent Claim
35 words
A process according to claim 3 wherein the gap between the rollers at their point of closest spacing is between 0.75 and 0.8 times the combined thickness of cloth and foam entering between the rollers.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein the cloth layers are applied sequentially to the opposite sides of the foam.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the foam has a cell structure having fewer than 40 cells per linear inch.
Claim 8
Dependent Claim
114 words
A process of laminating cloth to opposite sides of polyurethane foam, comprising the steps of: a. providing a sheet of polyurethane foam having a cell structure with fewer than 40 cells per linear inch, b. heating one side of the foam sheet to a temperature of at least 400*C. by means of a flame, c. pressing a cloth layer against said one side to laminate the cloth and foam, d. thereafter heating the other side of the foam sheet to a temperature no higher than 340*C. by means of a flame, and e. then pressing another cloth layeR against said other side of the foam to laminate the another cloth layer and the foam.
Claim 9
Dependent Claim
114 words
A process of laminating cloth to opposite sides of polyurethane foam, comprising the steps of: a. providing a sheet of polyurethane foam having a cell structure with fewer than 40 cells per linear inch, b. heating one side of the foam sheet to a temperature of at least 400*C. by means of a flame, c. pressing a cloth layer against said one side to laminate the cloth and foam, d. thereafter heating the other side of the foam sheet to a temperature no higher than 340*C. by means of a flame, and e. then pressing another cloth layeR against said other side of the foam to laminate the another cloth layer and the foam.
Claim 10
Dependent Claim
10 words
A laminated structure produced by the process of claim 1.
Claim 11
Dependent Claim
10 words
A laminated structure produced by the process of claim 7.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |