US3305435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making paper stiffened with waste pulp liquor solids
Assignee: Weyerhaeuser Co
•
Filing: 1966-07-07
•
Granted: 1967-02-21
•
Expires: 1986-07-07
Abstract
No abstract record available.
Inventors
- 👤 Edward M Williston
- 👤 Arthur S Gregory
- 👤 Clark C Heritage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:55
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/23; D21H17/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE METHOD OF MAKING A STIFFENED CORRUGATING MEDIUM COMPRISING THE STEPS OF FORMING A PAPER SHEET FROM AN AQUEOUS SLURRY OF CELLULOSIC FIBERS, SUBSTANTIALLY DRYING SAID FORMED SHEET, APPLYING TO AT LEAST ONE SURFACE OF THE PAPER SHEET A SOLUTION CONTAINING WASTE PULP LIQUOR SOLIDS, THEREAFTER COMPLETING THE DRYING OF THE PAPER SHEET AND FLUTING SAID SHEET.
Claim 2
Independent Claim
57 words
THE METHOD OF MAKING A STIFFENED CORRUGATING MEDIUM COMPRISING THE STEPS OF FORMING A PAPER SHEET FROM AN AQUEOUS SLURRY OF CELLULOSIC FIBERS, SUBSTANTIALLY DRYING SAID FORMED SHEET, APPLYING TO AT LEAST ONE SURFACE OF THE PAPER SHEET A SOLUTION CONTAINING WASTE PULP LIQUOR SOLIDS, THEREAFTER COMPLETING THE DRYING OF THE PAPER SHEET AND FLUTING SAID SHEET.
References Cited (Backward Citations)
US587237A
Cited
US2849314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |