Patent US3880977A successfully refreshed from Google Patents.
US3880977A
Expired / Lapsed
US
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Process for the conversion of polyurethane foam to a continuous densified sheet of polyurethane
Assignee: Ford Motor Co
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Filing: 1973-11-06
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Granted: 1975-04-29
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Expires: 1993-11-06
Abstract
Abstract A process is disclosed for converting polyurethane foam to useful, continuous, sheet material which comprises contacting the foam with acetic acid in aqueous solution and compressing the resultant surface-wet foam at a temperature in the range of 200*F. to 450*F. and under a pressure above about 400 psia.
Inventors
- 👤 Roy L Gealer
- 👤 Jacob Braslaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:39
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/911; Y10S264/916
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A METHOD FOR CONVERTING POLYURETHANE FOAM TO A CONTINUOUS DENSIFIED SHEET MATERIAL WHICH COMPRISES CONTACTING THE FOAM WITH A 15 TO 40 WEIGHT PERCENT AQUEOUS SOLUTION OF ACETIC ACID AND COMPRESSING THE RESULTANT SURFACE WET FOAM AT A TEMPERATURE IN THE RANGE OF 200*F. TO 450*F. AND UNDER A PRESSURE ABOVE ABOUT 400 PSIA.
Claim 2
Independent Claim
54 words
A METHOD FOR CONVERTING POLYURETHANE FOAM TO A CONTINUOUS DENSIFIED SHEET MATERIAL WHICH COMPRISES CONTACTING THE FOAM WITH A 15 TO 40 WEIGHT PERCENT AQUEOUS SOLUTION OF ACETIC ACID AND COMPRESSING THE RESULTANT SURFACE WET FOAM AT A TEMPERATURE IN THE RANGE OF 200*F. TO 450*F. AND UNDER A PRESSURE ABOVE ABOUT 400 PSIA.
Claim 3
Dependent Claim
35 words
A method in accordance with claim 1 wherein said pressure is in the range of about 400 to about 20,000 psia and is maintained for a time in the range of 0.1 to 15 minutes.
Claim 4
Dependent Claim
35 words
A method in accordance with claim 1 wherein said pressure is in the range of 1000 to 2000 psia and is maintained for a time in the range of about 0.5 to about 4 minutes.
Claim 5
Independent Claim
80 words
A method for converting polyurethane foam to a continuous densified sheet material which comprises boiling the polyurethane foam in 15 to 40 weight precent aqueous solution of acetic acid for a time in excess of 0.1 minute and compressing the resultant surface-wet foam at a temperature in the range of 200*F. to 450*F. and under a pressure in the range of about 400 to about 20,000 psia for a time in the range of about 0.1 to about 15 minutes.
Claim 6
Independent Claim
80 words
A method for converting polyurethane foam to a continuous densified sheet material which comprises boiling the polyurethane foam in 15 to 40 weight precent aqueous solution of acetic acid for a time in excess of 0.1 minute and compressing the resultant surface-wet foam at a temperature in the range of 200*F. to 450*F. and under a pressure in the range of about 400 to about 20,000 psia for a time in the range of about 0.1 to about 15 minutes.
Claim 7
Dependent Claim
39 words
A method in accordance with claim 4 wherein said foam is boiled for a time in the range of 0.1 to 10 minutes and said pressure is maintained for a time in the range of 0.5 to 4 minutes.
References Cited (Backward Citations)
US2933767A
Cited
US3050432A
Cited
US3306966A
Cited
US3263010A
Cited
US3171820A
Cited
US3398224A
Cited
US3325834A
Cited
US3443007A
Cited
US3577519A
Cited
US3726624A
Cited
US3746610A
Cited
US3795633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |