Patent US3864007A successfully refreshed from Google Patents.
US2665221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for impregnating cellulosic sheet
Assignee: Paper Patents Co
•
Filing: 1950-07-07
•
Granted: 1954-01-05
•
Expires: 1970-07-07
Abstract
No abstract record available.
Inventors
- 👤 Donald H Grangaard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:31
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/78; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48; D21H5/00; D21H5/0005; D21H5/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN THE MANUFACTURE OF RESIN-IMPREGNATED, CELLULOSIC SHEET PRODUCT BY THE USE OF WATER SOLUBLE PHENOLIC RESINS, THE IMPROVEMENT WHICH CONSISTS IN DRYING THE SHEET TO BE IMPREGNATED, AND THEN IMPREGNATING THE DRIED SHEET BY APPLYING THERETO A CONCENTRATED, WATER SOLUBLE PHENOLALDEHYDE RESIN SOLUTION CONTAINING AT LEAST ABOUT 68 TO 72 PER CENT PHENOL-ALDEHYDE RESIN SOLIDS, THE REMAINDER BEING SUBSTANTIALLY VOLATILIZABLE AND SUBSTANTIALLY ONE HALF OF SAID REAMINDER CONSTITUTING MOISTURE, THE MOISTURE CONTENT OF THE DRIED SHEET AND THE AMOUNT OF RESIN SOLUTION APPLIED TO THE SHEET BEING SO LIMITED THAT THE QUANTITY M IN THE FOLLOWING FORMULA, WHICH QUANTITY IS REPRESENTATIVE OF THE TOTAL MOISTURE AVAILABLE TO WET THE CELLULOSIC FIBERS OF THE SHEET AT THE TIME OF IMPREGNATION, DOSE NOT EXVEED 8-10%:
Claim 2
Dependent Claim
123 words
IN THE MANUFACTURE OF RESIN-IMPREGNATED, CELLULOSIC SHEET PRODUCT BY THE USE OF WATER SOLUBLE PHENOLIC RESINS, THE IMPROVEMENT WHICH CONSISTS IN DRYING THE SHEET TO BE IMPREGNATED, AND THEN IMPREGNATING THE DRIED SHEET BY APPLYING THERETO A CONCENTRATED, WATER SOLUBLE PHENOLALDEHYDE RESIN SOLUTION CONTAINING AT LEAST ABOUT 68 TO 72 PER CENT PHENOL-ALDEHYDE RESIN SOLIDS, THE REMAINDER BEING SUBSTANTIALLY VOLATILIZABLE AND SUBSTANTIALLY ONE HALF OF SAID REAMINDER CONSTITUTING MOISTURE, THE MOISTURE CONTENT OF THE DRIED SHEET AND THE AMOUNT OF RESIN SOLUTION APPLIED TO THE SHEET BEING SO LIMITED THAT THE QUANTITY M IN THE FOLLOWING FORMULA, WHICH QUANTITY IS REPRESENTATIVE OF THE TOTAL MOISTURE AVAILABLE TO WET THE CELLULOSIC FIBERS OF THE SHEET AT THE TIME OF IMPREGNATION, DOSE NOT EXVEED 8-10%:
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) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |