US3726756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulping of woody substances in gaseous media
Assignee: NEW FIBERS INTERNATIONAL A CORP OF PANAMA
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Filing: 1970-12-14
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Granted: 1973-04-10
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Expires: 1990-12-14
Abstract
Abstract LIGNIN IS EXTRACTED FROM WOOD CHIPS OR THE LIKE TO FORM WOOD PULP BY TREATING THE AMORPHOUS LIGNIN MOLECULE, WHICH BINDS CEMENTS THE INDIVIDUAL BUNDLES OF CELLULOSIC FIBRES, WITH A GASEOUS REACTANT IN AN ENVIRONMENT OF ULTRASONIC RADIATION WITHOUT CHANGE OF STATE OF THE REACTANT AND WITHOUT THE ADDITION OF PREPARED OR MIXED SOLVENTS OR AQUEOUS SOLUTIONS.
Inventors
- 👤 M Polak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:25
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/04; D21C3/06; D21C1/00; D21C1/06; D21C3/22; D21C3/224
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |