Patent US2901339A successfully refreshed from Google Patents.
US2901339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for conversion of ligno-cellulose materials
Assignee: Wooduse Inc
•
Filing: 1955-12-27
•
Granted: 1959-08-25
•
Expires: 1975-12-27
Abstract
No abstract record available.
Inventors
- 👤 Daryl R Boomer
- 👤 Edward T Clapperton
- 👤 Russell C Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:53
CPC Classifications
A; A23; A23K; A23K10/00; A23K10/30; A23K10/32; Y; Y10; Y10S; Y10S71/00; Y10S71/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A CONTINOUS PROCESS FOR THE CONVERSION OF PARTICULATE LIGNO-CELLULOSE MATERIALS RANGING FROM RELATIVELY SMALL TO RELATIVELY LARGE SIZES INTO LIGNIN-LIKE SUBSTANCES, WHICH COMPRISES THE STEPS OF MIXING THE PARTICLES WITH AT LEAST ONE MINERAL ACID, FEEDING THE MIXTURE INTO A FLOWING STREAM OF HOT GASES, CONVEYING SAID PARTICLES IN SUSPENSION IN SAID HOT GASES UPWARDLY THROUGH A VERTICAL REACTION ZONE, CONTROLLING THE VELOCITY OF THE HOT GASES THROUGH SUCH ZONE SO THAT SMALL PARTICLES ARE CAR-
Claim 2
Dependent Claim
76 words
A CONTINOUS PROCESS FOR THE CONVERSION OF PARTICULATE LIGNO-CELLULOSE MATERIALS RANGING FROM RELATIVELY SMALL TO RELATIVELY LARGE SIZES INTO LIGNIN-LIKE SUBSTANCES, WHICH COMPRISES THE STEPS OF MIXING THE PARTICLES WITH AT LEAST ONE MINERAL ACID, FEEDING THE MIXTURE INTO A FLOWING STREAM OF HOT GASES, CONVEYING SAID PARTICLES IN SUSPENSION IN SAID HOT GASES UPWARDLY THROUGH A VERTICAL REACTION ZONE, CONTROLLING THE VELOCITY OF THE HOT GASES THROUGH SUCH ZONE SO THAT SMALL PARTICLES ARE CAR-
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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |