Patent US2991194A successfully refreshed from Google Patents.
US2991194A
Expired / Lapsed
US
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Resin impregnating method
Assignee: HOWARD SMITH PAPER MILLS Ltd
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Filing: 1959-02-18
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Granted: 1961-07-04
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Expires: 1979-02-18
Abstract
No abstract record available.
Inventors
- 👤 Emile A Cambron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:56
CPC Classifications
C; C08; C08G; C08G8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN THE MANUFACTURE OF RESIN IMPREGNATED LAMINATING SHEET MATERIAL, THE CYCLIC PROCESS WHICH COMPRISES IMPREGNATING THE SHEET MATERIAL WITH A PHENOL FORMALDEHYDE RESIN VARNISH CONTAINING METHYL ALCOHOL AS A SOLVENT, PASSING THE IMPREGNATED SHEET MATERIAL THROUGH A DRYING ZONE THROUGH WHICH HOT AIR IS PASSED TO REMOVE METHYL ALCOHOL, WATER AND FORMALDEHYDE FROM THE IMPREGNATED SHEET MATERIAL, CONDUCTING EXHAUST VAPORS FROM THE DRYING ZONE AND PASSING THEM, AT ELEVATED TEMPERATURE, OVER A SUITABLE CATALYST BY MEANS OF WHICH THE METHYL ALCOHOL REACTS WITH OXYGEN IN THE EXHAUST VAPORS AND IS CONVERTED TO FORMALDEHYDE, ABSORBING IN WATER THE FORMALDEHYDE EVAPORATED FROM THE IMPREGNATED SHEET MATERIAL AND THE FORMALDEHYDE RESULTING FROM THE AFORESAID CONVERSION OF THE METHYL ALCOHOL, AND REUSING THE FORMALDEHYDE THUS PRODUCED AND RECOVERED FOR THE PREPARATION OF FRESH PHENOL FORMALDEHYDE RESIN, AND ADDING FRESH METHYL ALCOHOL TO PRODUCE VARNISH FOR USE IN THE IMPREGNATING OPERATION.
Claim 2
Dependent Claim
146 words
IN THE MANUFACTURE OF RESIN IMPREGNATED LAMINATING SHEET MATERIAL, THE CYCLIC PROCESS WHICH COMPRISES IMPREGNATING THE SHEET MATERIAL WITH A PHENOL FORMALDEHYDE RESIN VARNISH CONTAINING METHYL ALCOHOL AS A SOLVENT, PASSING THE IMPREGNATED SHEET MATERIAL THROUGH A DRYING ZONE THROUGH WHICH HOT AIR IS PASSED TO REMOVE METHYL ALCOHOL, WATER AND FORMALDEHYDE FROM THE IMPREGNATED SHEET MATERIAL, CONDUCTING EXHAUST VAPORS FROM THE DRYING ZONE AND PASSING THEM, AT ELEVATED TEMPERATURE, OVER A SUITABLE CATALYST BY MEANS OF WHICH THE METHYL ALCOHOL REACTS WITH OXYGEN IN THE EXHAUST VAPORS AND IS CONVERTED TO FORMALDEHYDE, ABSORBING IN WATER THE FORMALDEHYDE EVAPORATED FROM THE IMPREGNATED SHEET MATERIAL AND THE FORMALDEHYDE RESULTING FROM THE AFORESAID CONVERSION OF THE METHYL ALCOHOL, AND REUSING THE FORMALDEHYDE THUS PRODUCED AND RECOVERED FOR THE PREPARATION OF FRESH PHENOL FORMALDEHYDE RESIN, AND ADDING FRESH METHYL ALCOHOL TO PRODUCE VARNISH FOR USE IN THE IMPREGNATING OPERATION.
References Cited (Backward Citations)
US1913405A
Cited
GB479257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |