Patent US2816833A successfully refreshed from Google Patents.
US2816833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wet strength paper
Assignee: Synvar Corp
•
Filing: 1954-06-22
•
Granted: 1957-12-17
•
Expires: 1974-06-22
Abstract
No abstract record available.
Inventors
- 👤 Leopold F Bornstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:34
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A WET STRENGHT PAPER INCORPORATED THEREIN PRIOR TO SHEET FORMATION, AT AN ALKALINE PH, 0.5 TO 3.0 PERCENT OF QUEBRACHO EXTACT AND 0.02 TO 0.75 PERCENT OF FORMALDEHYDE, SAID PERCENTS BEING BASED BY WEIGHT ON THE CELLULOSE CONTENT OF SAID PAPER.
Claim 2
Dependent Claim
41 words
A WET STRENGHT PAPER INCORPORATED THEREIN PRIOR TO SHEET FORMATION, AT AN ALKALINE PH, 0.5 TO 3.0 PERCENT OF QUEBRACHO EXTACT AND 0.02 TO 0.75 PERCENT OF FORMALDEHYDE, SAID PERCENTS BEING BASED BY WEIGHT ON THE CELLULOSE CONTENT OF SAID PAPER.
References Cited (Backward Citations)
US71893A
Cited
GB190826445A
Cited
US1160362A
Cited
US1105195A
Cited
US1280400A
Cited
US2010635A
Cited
GB474361A
Cited
US2338602A
Cited
US2286643A
Cited
GB597387A
Cited
US2622960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |