Patent US2806787A successfully refreshed from Google Patents.
US2806787A
Expired / Lapsed
US
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Method of making corrugated paper products utilizing a dextran-form-aldehyde reaction product
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1953-11-06
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Granted: 1957-09-17
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Expires: 1973-11-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry A Toulmin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:47
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; C; C09; C09J; C09J105/00; C09J105/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
THE METHOD OF MAKING CORRUGATED PAPER PRODUCTS WHICH COMPRISES INCORPORATING WITH PAPER-MAKING STOCK COMPRISING CELLULOSE FIBERS A WATER-DISPERSIBLE PARTIAL REACTION PRODUCT OF FORMALDEHYDE WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE, NATIVE, MICROBIOLOGICALLY PRODUCED DEXTRAN, CARBOXYMETHYL ETHERS OF SAID DEXTRAN CONTAINING AN AVERAGE OF 1.0 TO 2.0 CARBOXYMETHYL GROUPS PER ANHYDROGLUCOSE UNIT OF THE DEXTRAN, AND CARBOXYETHYL ETHERS OF SAID DEXTRAN CONTAINING AN AVERAGE OF 1.0 TO 2.0 CARBOXYETHYL GROUPS PER ANHYDROGLUCOSE UNIT OF THE DEXTRAN, IN AN AMOUNT BETWEEN 2% AND 10% ON THE FIBER WEIGHT, DILUTING THE STOCK WITH WATER TO A CONTENT OF 0.1% TO 5% OF THE PARTIAL REACTION PRODUCT, ADDING AN ACID TO THE DILUTED STOCK TO ADJUST THE PH THEREOF TO 1.2 TO 2.5, SHEETING THE STOCK, ASSEMBLING A PLURALITY OF THE SHEETS IN SUPERIMPOSED RELATION, DRYING THE ASSEMBLED SHEETS, THE SHEETING, ASSEMBLING AND DRYING OPERATIONS BEING CARRIED OUT AT A TEMPERATURE OF ABOUT 50*C. TO 70*C. AND WITHOUT SETTING OF THE PARTIAL RECTION PRODUCT TO COMPLETELY REACTED
Claim 2
Independent Claim
166 words
THE METHOD OF MAKING CORRUGATED PAPER PRODUCTS WHICH COMPRISES INCORPORATING WITH PAPER-MAKING STOCK COMPRISING CELLULOSE FIBERS A WATER-DISPERSIBLE PARTIAL REACTION PRODUCT OF FORMALDEHYDE WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE, NATIVE, MICROBIOLOGICALLY PRODUCED DEXTRAN, CARBOXYMETHYL ETHERS OF SAID DEXTRAN CONTAINING AN AVERAGE OF 1.0 TO 2.0 CARBOXYMETHYL GROUPS PER ANHYDROGLUCOSE UNIT OF THE DEXTRAN, AND CARBOXYETHYL ETHERS OF SAID DEXTRAN CONTAINING AN AVERAGE OF 1.0 TO 2.0 CARBOXYETHYL GROUPS PER ANHYDROGLUCOSE UNIT OF THE DEXTRAN, IN AN AMOUNT BETWEEN 2% AND 10% ON THE FIBER WEIGHT, DILUTING THE STOCK WITH WATER TO A CONTENT OF 0.1% TO 5% OF THE PARTIAL REACTION PRODUCT, ADDING AN ACID TO THE DILUTED STOCK TO ADJUST THE PH THEREOF TO 1.2 TO 2.5, SHEETING THE STOCK, ASSEMBLING A PLURALITY OF THE SHEETS IN SUPERIMPOSED RELATION, DRYING THE ASSEMBLED SHEETS, THE SHEETING, ASSEMBLING AND DRYING OPERATIONS BEING CARRIED OUT AT A TEMPERATURE OF ABOUT 50*C. TO 70*C. AND WITHOUT SETTING OF THE PARTIAL RECTION PRODUCT TO COMPLETELY REACTED
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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) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |