Patent US2987434A successfully refreshed from Google Patents.
US2987434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making pulp
Assignee: Lawrence University
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Filing: 1958-09-09
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Granted: 1961-06-06
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Expires: 1978-09-09
Abstract
No abstract record available.
Inventors
- 👤 Maija L Murray
- 👤 Jr Kyle Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:31
CPC Classifications
D; D21; D21H; D21H11/00; D21H11/16; D21H11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
THE METHOD OF MAKING IMPROVED CELLULOSIC PULP FOR THE MANUFACTURE OF PAPER OF INCREASED FOLD ENDURANCE AND TENSILE STRENGTH, SAID METHOD COMPRISING THE STEPS OF PREPARING DRIED CELLULOSIC PULP, TREATING SAID PULP IN SITU IN AN AT LEAST SUBSTANTIALLY ANHYDROUS ENVIRONMENT BY IMMERSING SAID PULP IN AN AT LEAST SUBSTANTIALLY ANHYDROUS REAGENT COMPRISING A MIXTURE OF DIMETHYL SULFOXIDE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOCHLOROACETIC, MONOIODOACETIC, MONOBROMOACETIC, MONOCHLOROPROPIONIC AND MONOCHLOROBUTYRIC ACIDS AND MIXTURES THEREOF, SAID COMPOUND BEING PRESENT IN AN AMOUNT SUFFICIENT TO BRING ABOUT CARBOXYALKYLATION OF THE CELLULOSE OF SAID PULP TO A LOW DEGREE OF SUBSTITUTION, LESS THAN 0.08, SAID PULP BEINGMAINTAINED IN SAID REAGENT UNTIL SAID LOW DEGREE OF SUBSTITUTION IS OBTAINED, AND SUBSEQUENTLY BEATING SAID PULP.
Claim 2
Independent Claim
123 words
THE METHOD OF MAKING IMPROVED CELLULOSIC PULP FOR THE MANUFACTURE OF PAPER OF INCREASED FOLD ENDURANCE AND TENSILE STRENGTH, SAID METHOD COMPRISING THE STEPS OF PREPARING DRIED CELLULOSIC PULP, TREATING SAID PULP IN SITU IN AN AT LEAST SUBSTANTIALLY ANHYDROUS ENVIRONMENT BY IMMERSING SAID PULP IN AN AT LEAST SUBSTANTIALLY ANHYDROUS REAGENT COMPRISING A MIXTURE OF DIMETHYL SULFOXIDE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOCHLOROACETIC, MONOIODOACETIC, MONOBROMOACETIC, MONOCHLOROPROPIONIC AND MONOCHLOROBUTYRIC ACIDS AND MIXTURES THEREOF, SAID COMPOUND BEING PRESENT IN AN AMOUNT SUFFICIENT TO BRING ABOUT CARBOXYALKYLATION OF THE CELLULOSE OF SAID PULP TO A LOW DEGREE OF SUBSTITUTION, LESS THAN 0.08, SAID PULP BEINGMAINTAINED IN SAID REAGENT UNTIL SAID LOW DEGREE OF SUBSTITUTION IS OBTAINED, AND SUBSEQUENTLY BEATING SAID PULP.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |