Patent US2687556A successfully refreshed from Google Patents.
US2687556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing products comprising compressed lignocellulosic materials and chemically combined soluble silicates
Assignee: Individual
•
Filing: 1951-01-05
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Granted: 1954-08-31
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Expires: 1971-01-05
Abstract
No abstract record available.
Inventors
- 👤 Donald F Othmer
- 👤 Louis G Ricciardi
- 👤 Warren R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:06
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; C08L97/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE DRY METHOD OF PREPARING DENSE, WATERRESISTANT, MOLDED PRODUCTS COMPRISING MIXING SUBSTANTIALLY DRY LIGNIN POWDER WITH SUBSTANTIALLY DRY LIGNOCELLULOSE PARTICLES AND ADDING AN AQUEOUS SOLUTION OF ALKALI METAL SILICATE IN AN AMOUNT SUFFICIENT TO ACTIVATE THE LIGNIN AT AN ELEVATED TEMPERATURE AND PRESSURE TO THE RESULTING LIGNOCELLULOSE-LIGNIN MIXTURE AND THEREAFTER SUBJECTING THE RESULTING COMPOSITION TO SAID ELEVATED TEMPERATURE AND PRESSURE SUFFICIENT TO ACTIVATE THE LIGNIN AND THEREBY EFFECT A STRONG BOND AMONG THE LIGNOCELLULOSE PARTICLES.
Claim 2
Dependent Claim
75 words
THE DRY METHOD OF PREPARING DENSE, WATERRESISTANT, MOLDED PRODUCTS COMPRISING MIXING SUBSTANTIALLY DRY LIGNIN POWDER WITH SUBSTANTIALLY DRY LIGNOCELLULOSE PARTICLES AND ADDING AN AQUEOUS SOLUTION OF ALKALI METAL SILICATE IN AN AMOUNT SUFFICIENT TO ACTIVATE THE LIGNIN AT AN ELEVATED TEMPERATURE AND PRESSURE TO THE RESULTING LIGNOCELLULOSE-LIGNIN MIXTURE AND THEREAFTER SUBJECTING THE RESULTING COMPOSITION TO SAID ELEVATED TEMPERATURE AND PRESSURE SUFFICIENT TO ACTIVATE THE LIGNIN AND THEREBY EFFECT A STRONG BOND AMONG THE LIGNOCELLULOSE PARTICLES.
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) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |