US3081218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous pulping process for the production of paper products
Assignee: Individual
•
Filing: 1960-03-18
•
Granted: 1963-03-12
•
Expires: 1980-03-18
Abstract
No abstract record available.
Inventors
- 👤 Harold R Ambuehl
- 👤 Jesse J Lowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:42
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/24; D21C5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A CONTINUOUS PROCESS FOR PULPING OF FIBROUS, NONWOODY, LIGNO-CELLULOSE CONTAINING PLANT MATERIALS WHICH COMPRISES THE STEPS OF SCREENING THE MATERIAL TO REMOVE A PROPORTION OF THE DIRT, DUST AND PITH-TYPE MATERIAL THEREIN; PRE-HYDROLYZING THE SCREENED MATERIAL WITH A MOISTURE CONTENT BY WEIGHT OF OVEN DRY MATERIAL OF FROM 65% TO 90% FOR NOT LESS THAN FIVE MINUTES NOR MORE THAN 50 MINUTES AT A TEMPRATURE NOT LESS THAN 140* C. AND NOT MORE THAN 190* C.; SPRAYING THE PRE-HYDROLYZED MATERIAL IN A BLOW CYCLONE; DE-MOISTURIZING THE MATERIAL; COMPRESSING THE MATERIAL AND SUBSEQUENTLY SHREDDING THE COM-
Claim 2
Dependent Claim
95 words
A CONTINUOUS PROCESS FOR PULPING OF FIBROUS, NONWOODY, LIGNO-CELLULOSE CONTAINING PLANT MATERIALS WHICH COMPRISES THE STEPS OF SCREENING THE MATERIAL TO REMOVE A PROPORTION OF THE DIRT, DUST AND PITH-TYPE MATERIAL THEREIN; PRE-HYDROLYZING THE SCREENED MATERIAL WITH A MOISTURE CONTENT BY WEIGHT OF OVEN DRY MATERIAL OF FROM 65% TO 90% FOR NOT LESS THAN FIVE MINUTES NOR MORE THAN 50 MINUTES AT A TEMPRATURE NOT LESS THAN 140* C. AND NOT MORE THAN 190* C.; SPRAYING THE PRE-HYDROLYZED MATERIAL IN A BLOW CYCLONE; DE-MOISTURIZING THE MATERIAL; COMPRESSING THE MATERIAL AND SUBSEQUENTLY SHREDDING THE COM-
References Cited (Backward Citations)
US1931575A
Cited
US2625474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |