US2552597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making a molded article from lignocellulose
Assignee: LOUIS RICCIARDI
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Filing: 1947-07-09
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Granted: 1951-05-15
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Expires: 1967-07-09
Abstract
No abstract record available.
Inventors
- 👤 Warren R Smith
- 👤 Edmund R Mellenger
- 👤 Donald F Othmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:34
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
THE PROCESS FOR MAKING A HARD, STRONG, WATER RESISTANT SUBSTANTIALLY DRY PRODUCT FROM LIGNOCELLULOSIC PARTICLES OR FIBERS AND ADDED LIGNIN, COMPRISING MIXING THEREWITH POWDERED SULFUR FROM ABOUT 3 PER CENT TO ABOUT 6 PER CENT OF THE WEIGHT OF THE LIGNOCELLULOSE AND THEN SUBJECTING THE SAID MIXTURE TO A PRESSURE OF ABOUT 720 TO 780 POUNDS PER SQUARE INCH AND AT A TEMPERATURE OF ABOUT 225* C. TO ABOUT 250* C. WHEREBY CHEMICAL BONDING IS EFFECTED BETWEEN THE SAID SULFUR AND THE SAID LIGNOCELLULOSIC MATERIAL TO PRODUCE A UNIFORM SOLID.
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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |