US3305432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making of cellulose pulp
Assignee: Individual
•
Filing: 1963-07-15
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Granted: 1967-02-21
•
Expires: 1983-07-15
Abstract
No abstract record available.
Inventors
- 👤 William R Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:34
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/003; D21C1/00; D21C1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE METHOD OF MAKING PULP FROM NATURAL CELLULOSIC MATERIAL SUCH AS WOOD, WHICH COMPRISES THE STEPS OF: FIRST REMOVING THE IMBIBED MOISTURE FROM SAID PARTICLES; SOAKING AND SQUEEZING THE SOLUTION FROM THE PARTICLES; SOLUTION; DRAINING AND SQUEEZING THE SOLUTION FROM THE PARTICLES; THEN SOAKING THE PARTICLES IN A PULPING LIQUOR SELECTED FROM THE GROUP OF PULPING SOLUTIONS COMPRISING ACID SULFITE SOLUTIONS, NEUTRAL SULFITE SOLUTIONS AND ALKALINE SULFIDE SOLUTIONS; DRAINING THE LIQUID FROM THE PARTICLES; WASHING THE PARTICLES WITH THE CONCENTRATED HYDROTROPIC SALT SOLUTION; AND REMOVING THE LAST NAMED SOLUTION BY WASHING THE PARTICLES WITH WATER.
Claim 2
Independent Claim
95 words
THE METHOD OF MAKING PULP FROM NATURAL CELLULOSIC MATERIAL SUCH AS WOOD, WHICH COMPRISES THE STEPS OF: FIRST REMOVING THE IMBIBED MOISTURE FROM SAID PARTICLES; SOAKING AND SQUEEZING THE SOLUTION FROM THE PARTICLES; SOLUTION; DRAINING AND SQUEEZING THE SOLUTION FROM THE PARTICLES; THEN SOAKING THE PARTICLES IN A PULPING LIQUOR SELECTED FROM THE GROUP OF PULPING SOLUTIONS COMPRISING ACID SULFITE SOLUTIONS, NEUTRAL SULFITE SOLUTIONS AND ALKALINE SULFIDE SOLUTIONS; DRAINING THE LIQUID FROM THE PARTICLES; WASHING THE PARTICLES WITH THE CONCENTRATED HYDROTROPIC SALT SOLUTION; AND REMOVING THE LAST NAMED SOLUTION BY WASHING THE PARTICLES WITH WATER.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |