US2846431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water soluble thermo-setting resin and method for its manufacture
Assignee: Permanente Cement Co
•
Filing: 1951-10-01
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Granted: 1958-08-05
•
Expires: 1971-10-01
Abstract
No abstract record available.
Inventors
- 👤 Worth C Goss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:02
CPC Classifications
C; C08; C08H; C08H6/00; D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE PROCESS OF MAKING A THERMO-SETTING PLASTIC OF THE CHARACTER DESCRIBED FROM A SULPHITE PULP LIQUOR, COMPRISING SUBJECTING THE LIQUOR TO HEAT AND STEAM PRESSURE TO EFFECT STRIPPING OF FREE SULPHUR DIOXIDE THEREFROM, ADDING AMMONIA TO THE LIQUOR AFTER THE STRIPPING OF THE SULPHUR DIOXIDE THEREFROM, AND WHILE THE LIQUOR IS MAINTAINED SUBSTANTIALLY AT A TEMPERATURE OF ABOUT 300*F. AND UNDER PRESSURE, SUBJECTING IT TO OXIDATION BY PASSING AIR THERETHROUGH, DISTILLING OFF THE AMMONIA UNTIL THE PH IS REDUCED TO APPROXIMATELY 8, FILTERING THE LIQUOR, AND ACIDIFYING THE CLARIFIED LIQUOR TO PRECIPITATE AND RECOVER THEREFROM A THERMO-SETTING RESIN.
Claim 2
Dependent Claim
98 words
THE PROCESS OF MAKING A THERMO-SETTING PLASTIC OF THE CHARACTER DESCRIBED FROM A SULPHITE PULP LIQUOR, COMPRISING SUBJECTING THE LIQUOR TO HEAT AND STEAM PRESSURE TO EFFECT STRIPPING OF FREE SULPHUR DIOXIDE THEREFROM, ADDING AMMONIA TO THE LIQUOR AFTER THE STRIPPING OF THE SULPHUR DIOXIDE THEREFROM, AND WHILE THE LIQUOR IS MAINTAINED SUBSTANTIALLY AT A TEMPERATURE OF ABOUT 300*F. AND UNDER PRESSURE, SUBJECTING IT TO OXIDATION BY PASSING AIR THERETHROUGH, DISTILLING OFF THE AMMONIA UNTIL THE PH IS REDUCED TO APPROXIMATELY 8, FILTERING THE LIQUOR, AND ACIDIFYING THE CLARIFIED LIQUOR TO PRECIPITATE AND RECOVER THEREFROM A THERMO-SETTING RESIN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |