Patent US3879251A successfully refreshed from Google Patents.
US3879251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing laminates requiring the application of heat
Assignee: TOTEBO A CORP OF SWEDEN AB
•
Filing: 1972-12-04
•
Granted: 1975-04-22
•
Expires: 1992-12-04
Abstract
Abstract The process of laminating a flexible thermoplastics sheet to a rigid base sheet using a thermoplastic adhesive which is heat activated wherein a web like electrical element is applied to the sheets whilst they are clamped in a laminating press, the power input for the heating process requiring an electrical input of from 4 KVA to 12 KVA per square foot of element which is applied for a period of 4 seconds to 18 seconds. One of the platens is cooled to serve as a heat sink so that during heating heat flows not into the laminate, but also into the heat sink, and after the input power is removed, the laminate remains clampled for a cooling period whilst heat flows from the laminate into the heat sink.
Inventors
- 👤 Robert Edward Ingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:51
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C43/00; B29C43/32; B29C43/52; B30; B30B; B30B15/00; B30B15/06; B32B21/00; B32B21/04; B32B21/08; B32B21/14; B32B27/30; B32B27/304; B32B7/00; B32B7/04; B32B7/12; B29C33/00; B29C33/20; B32B2327/00; B32B2327/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
19 words
A method of laminating a thermoplastic sheet to the wood surface of a base sheet, comprising the steps of
Claim 2
Independent Claim
19 words
A method of laminating a thermoplastic sheet to the wood surface of a base sheet, comprising the steps of
Claim 3
Dependent Claim
12 words
applying a thermoplastic adhesive between the wood surface and the thermoplastic sheet,
Claim 4
Dependent Claim
12 words
applying a thermoplastic adhesive between the wood surface and the thermoplastic sheet,
Claim 5
Independent Claim
142 words
A method of laminating a thermoplastic sheet to the wood surface of a base sheet, comprising the steps of 1. applying a thermoplastic adhesive between the wood surface and the thermoplastic sheet, 2. clamping the sheets together between a first press platen constituting a heat sink and a second press platen, 3. applying electrical power to a flat sheet-like electrical heating element situated between one of the sheets and the adjacent platen, the electrical power being in the range of 4 to 8 KVA per square foot of heating element area, and the electrical power being applied for a period of 4 to 18 seconds, 4. and cooling the laminated sheets while they are clamped between the platens by cutting off the electrical power to the heating element and allowing the heat to drain from the laminate into the heat sink platen.
Claim 6
Independent Claim
142 words
A method of laminating a thermoplastic sheet to the wood surface of a base sheet, comprising the steps of 1. applying a thermoplastic adhesive between the wood surface and the thermoplastic sheet, 2. clamping the sheets together between a first press platen constituting a heat sink and a second press platen, 3. applying electrical power to a flat sheet-like electrical heating element situated between one of the sheets and the adjacent platen, the electrical power being in the range of 4 to 8 KVA per square foot of heating element area, and the electrical power being applied for a period of 4 to 18 seconds, 4. and cooling the laminated sheets while they are clamped between the platens by cutting off the electrical power to the heating element and allowing the heat to drain from the laminate into the heat sink platen.
Claim 7
Dependent Claim
22 words
The method according to claim 1 wherein a hollow heat sink platen is employed, and the method further includes the step of
Claim 8
Dependent Claim
18 words
clamping the sheets together between a first press platen constituting a heat sink and a second press platen,
Claim 9
Dependent Claim
18 words
clamping the sheets together between a first press platen constituting a heat sink and a second press platen,
Claim 10
Dependent Claim
36 words
and cooling the laminated sheets while they are clamped between the platens by cutting off the electrical power to the heating element and allowing the heat to drain from the laminate into the heat sink platen.
Claim 11
Dependent Claim
36 words
and cooling the laminated sheets while they are clamped between the platens by cutting off the electrical power to the heating element and allowing the heat to drain from the laminate into the heat sink platen.
Claim 12
Dependent Claim
18 words
causing a cooling fluid to circulate in the heat sink platen during the cooling of the laminated sheets.
Claim 13
Dependent Claim
18 words
causing a cooling fluid to circulate in the heat sink platen during the cooling of the laminated sheets.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |