US2539183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making mositureesistant paper
Assignee: Individual
•
Filing: 1944-11-29
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Granted: 1951-01-23
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Expires: 1964-11-29
Abstract
No abstract record available.
Inventors
- 👤 Chester H Child
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:14
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/62; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/50; D21H17/60; D21H17/63; D21H17/66; D21H21/00; D21H21/14; D21H21/16; D21H23/00; D21H23/76; D21H23/765
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A METHOD OF MAKING A MOSITURE RESISTANT PAPER WHICH INCLUDES THE STEPS OF ADDING TO THE PAPER MAKING STOCK PRIOR TO THE FORMATION OF A WEB THEREFROM, ABOUT 1 TO 5% OF ROSIN SIZE BASED ON THE DRY WEIGHT OF THE PULP AND ABOUT 2 TO 5% OF PARAFFIN WAX BASED ON THE DRY WEIGHT OF THE PULP, SAID WAX BEING IN THE FORM OF AN ACID UNSTABLE AQUEOUS EMULSION, PRECIPITATING THE WAX AND ROSIN ON THE FIBERS BY ACIDIFYING THE STOCK WITH ALUM SUBSEQUENT TO THE INCORPORATION OF WAX AND ROSIN, BONDING THE PRECIPITATED WAX TO THE FIBERS BY MEANS OF WATER SOLUBLE, CURABLE UREAFORMALDEHYDE RESIN IN AN AMOUNT COMPRISING ABOUT 2 TO 5% OF THE DRY WEIGHT OF THE PULP, SAID RESIN BEING ADDED TO THE ACIDIFIED STOCK IN THE FORM OF AN AQUEOUS SOLUTION, FORMING THE STOCK INTO A WEB AND CURING THE RESIN, SAID PAPER BEING CHARACTERIZED BY SUBSTANTIALLY REDUCED WATER ABSORBENCY, LOW SLIPPAGE AND HIGH FLEXIBILITY.
Claim 2
Independent Claim
161 words
A METHOD OF MAKING A MOSITURE RESISTANT PAPER WHICH INCLUDES THE STEPS OF ADDING TO THE PAPER MAKING STOCK PRIOR TO THE FORMATION OF A WEB THEREFROM, ABOUT 1 TO 5% OF ROSIN SIZE BASED ON THE DRY WEIGHT OF THE PULP AND ABOUT 2 TO 5% OF PARAFFIN WAX BASED ON THE DRY WEIGHT OF THE PULP, SAID WAX BEING IN THE FORM OF AN ACID UNSTABLE AQUEOUS EMULSION, PRECIPITATING THE WAX AND ROSIN ON THE FIBERS BY ACIDIFYING THE STOCK WITH ALUM SUBSEQUENT TO THE INCORPORATION OF WAX AND ROSIN, BONDING THE PRECIPITATED WAX TO THE FIBERS BY MEANS OF WATER SOLUBLE, CURABLE UREAFORMALDEHYDE RESIN IN AN AMOUNT COMPRISING ABOUT 2 TO 5% OF THE DRY WEIGHT OF THE PULP, SAID RESIN BEING ADDED TO THE ACIDIFIED STOCK IN THE FORM OF AN AQUEOUS SOLUTION, FORMING THE STOCK INTO A WEB AND CURING THE RESIN, SAID PAPER BEING CHARACTERIZED BY SUBSTANTIALLY REDUCED WATER ABSORBENCY, LOW SLIPPAGE AND HIGH FLEXIBILITY.
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) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |