US3371054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formaldehyde-reactive acid bark and bark resins and method of forming same
Assignee: Champion Papers Inc
•
Filing: 1965-04-26
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Granted: 1968-02-27
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Expires: 1985-04-26
Abstract
No abstract record available.
Inventors
- 👤 Philip S Blickensderfer
- 👤 Alan E Weinberg
- 👤 William F Oliver
- 👤 Rafaef J Perez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:25
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10; C08G16/00; C08G16/02; C08G16/0293; C08G8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF FORMING A RESIN WHICH COMPRISES REDUCING TREE BARK TO FINE PARTICLE SIZE, SEPARATING FIBROUS PARTICLES OF THE BARK FROM NON-FIBROUS PARTICLES, MIXING THE NON-FIBROUS PARTICLES WITH AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION TO FORM A MIXTURE, HEATING THE MIXTURE IN A SUBSTANTIALLY OXYGEN-FRR ATMOSPHERE TO DRIVE OFF WATER AND UNTIL THE TEMPERATURE THEREOF REACHES APPROXIMATELY 200*C. TO 260*C. TO FORM A SUBSTANTIALLY DRY ALKALI BARK, FORMING A SLURRY OF THE ALKALI BARK IN WATER, ACIDIFYING THE SLURRY TO FORM AN ACID BARK THEREIN, AND CONDENSING THE ACID WITH FORMALDEHYDE.
Claim 2
Independent Claim
92 words
A METHOD OF FORMING A RESIN WHICH COMPRISES REDUCING TREE BARK TO FINE PARTICLE SIZE, SEPARATING FIBROUS PARTICLES OF THE BARK FROM NON-FIBROUS PARTICLES, MIXING THE NON-FIBROUS PARTICLES WITH AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION TO FORM A MIXTURE, HEATING THE MIXTURE IN A SUBSTANTIALLY OXYGEN-FRR ATMOSPHERE TO DRIVE OFF WATER AND UNTIL THE TEMPERATURE THEREOF REACHES APPROXIMATELY 200*C. TO 260*C. TO FORM A SUBSTANTIALLY DRY ALKALI BARK, FORMING A SLURRY OF THE ALKALI BARK IN WATER, ACIDIFYING THE SLURRY TO FORM AN ACID BARK THEREIN, AND CONDENSING THE ACID WITH FORMALDEHYDE.
References Cited (Backward Citations)
US2574785A
Cited
US3025250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |