US2664377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of impregnating and laminating fibrous materials with lignin
Assignee: Weyerhaeuser Timber Co
•
Filing: 1950-04-24
•
Granted: 1953-12-29
•
Expires: 1970-04-24
Abstract
No abstract record available.
Inventors
- 👤 William G Van Beckum
- 👤 Arnulf K Esterer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:39
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/005; C08L1/00; C08L1/02; C08L61/00; C08L61/04; C08L61/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
THE METHOD OF PREPARING A FIBROUS LAMINATAED PRODUCT WHICH CONSISTS ESSENTIALLY OF PREPARING AN AQUEOUS SOLUTION OF THE AMMONIUM SALTS OF LIGNIN ACIDS, SUBJECTING THE SEPARATE FIBROUS LAMINAE TO THE WETTING ACTION OF SAID SOLUTION, EVAPORATING THE WATER OF SOLUTION LEAVING THE AMMONIUM SALT OF LIGNIN ACID INTIMATELY DISPERSED IN SITU IN SAID FIBROUS MATERIAL, ASSEMBLING SAID LAMINAE IN SUPERIMPOSED RELATION, AND APPLYING HEAT TO DECOMPOSE THE AMMONIUM SALT OF LIGNIN INTO VOLATILE AMMONIA AND WATER INSOLUBLE LIGNIN FREE ACID, AND APPLYING PRESSURE TO CAUSE THE FIBROUS LAMINAE TO BOND TOGETHER.
References Cited (Backward Citations)
US1899526A
Cited
US2037001A
Cited
US2242601A
Cited
US2319182A
Cited
US2247208A
Cited
US2319883A
Cited
US2380448A
Cited
US2485587A
Cited
US2521532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |