US3108990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of stabilizing phenol formaldehyde resin
Assignee: Weyerhaeuser Co
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Filing: 1958-05-22
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Granted: 1963-10-29
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Expires: 1978-05-22
Abstract
No abstract record available.
Inventors
- 👤 Gene F Baxter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:46
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
THE PROCESS OF STABILIZING RESINS COMPRISING: TO A WATER SOLUBLE, PH 10.0 TO 14.0 PHENOL-FORMALDEHYDE RESIN ADDING AN ANTIOXIDANT MATERIAL SELECTED FROM THE GROU CONSISTING OF SODIUM SULFITE, SODIUM BISULFITE, SODIUM METABISULFITE, SULFUR DIOXIDE, SULFUROUS ACID, SODIUM SULFIDE, AND AND MIXTURES THEREOF; SAID SELECTED MATERIAL BEING ADDED AFTER COMPLETION OF CONDENSATION OF THE RESIN; SAID ADDITION, EXPRESSED AS SODIUM SULFITE, BEING IN THE MOLAR RATIO RANGE FROM 0.003 TO 0.13 MOLE OF ADDITIVE PER MOLE OF PHENOL IN THE RESIN, SAID RESIN HAVING A MOLAR RATIO OF ABOUT 1:1.7 UP TO ABOUT 1:2.33 PHENOL TO FORMALDEHYDE.
Claim 2
Dependent Claim
96 words
THE PROCESS OF STABILIZING RESINS COMPRISING: TO A WATER SOLUBLE, PH 10.0 TO 14.0 PHENOL-FORMALDEHYDE RESIN ADDING AN ANTIOXIDANT MATERIAL SELECTED FROM THE GROU CONSISTING OF SODIUM SULFITE, SODIUM BISULFITE, SODIUM METABISULFITE, SULFUR DIOXIDE, SULFUROUS ACID, SODIUM SULFIDE, AND AND MIXTURES THEREOF; SAID SELECTED MATERIAL BEING ADDED AFTER COMPLETION OF CONDENSATION OF THE RESIN; SAID ADDITION, EXPRESSED AS SODIUM SULFITE, BEING IN THE MOLAR RATIO RANGE FROM 0.003 TO 0.13 MOLE OF ADDITIVE PER MOLE OF PHENOL IN THE RESIN, SAID RESIN HAVING A MOLAR RATIO OF ABOUT 1:1.7 UP TO ABOUT 1:2.33 PHENOL TO FORMALDEHYDE.
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) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |