Patent US2971879A successfully refreshed from Google Patents.
US2971879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-laid fibrous sheets
Assignee: Armstrong World Industries Inc
•
Filing: 1957-11-12
•
Granted: 1961-02-14
•
Expires: 1977-11-12
Abstract
No abstract record available.
Inventors
- 👤 Jay L Piersol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:55
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/675; D21H17/20; D21H17/33; D21H17/34; D21H17/35; D21H23/00; D21H23/76; D21H23/765
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE PROCESS OF PRODUCING FELTED FIBER PRODUCTS BY SUSPENDING FIBERS IN A SOLUTION CONTAINING THE DISSOLVED SALT OF THE METAL OF THE GROUP CONSISTING OF ALUMINUM, MAGNESIUM, AND ZINC, MIXING WITH SAID SOLUTION AND THE FIBERS SUSPENDED THEREIN AN AQUEOUS SOLUTION OF AMMONIUM HYDROXIDE TO A SUBSTANTIALLY NEUTRAL PH, AND THEREAFTER MIXING WITH THE THUS TREATED FIBERS IN SUSPENSION A LATEX OF A SYNTHETIC RUBBER TO FORM A PAPERMAKING SLURRY OF RUBBER-COATED FIBERS, THE STEP OF IMPROVING THE DRAINAGE RATE OF SAID SLURRY BY ADDING FINELY DIVIDED ZINC OXIDE THERETO SUBSEQUENT TO THE ADDITION OF SAID AMMONIUM HYDROXIDE AND PRIOR TO THE ADDITION OF SAID SYNTHETIC RUBBER LATEX.
Claim 2
Dependent Claim
109 words
IN THE PROCESS OF PRODUCING FELTED FIBER PRODUCTS BY SUSPENDING FIBERS IN A SOLUTION CONTAINING THE DISSOLVED SALT OF THE METAL OF THE GROUP CONSISTING OF ALUMINUM, MAGNESIUM, AND ZINC, MIXING WITH SAID SOLUTION AND THE FIBERS SUSPENDED THEREIN AN AQUEOUS SOLUTION OF AMMONIUM HYDROXIDE TO A SUBSTANTIALLY NEUTRAL PH, AND THEREAFTER MIXING WITH THE THUS TREATED FIBERS IN SUSPENSION A LATEX OF A SYNTHETIC RUBBER TO FORM A PAPERMAKING SLURRY OF RUBBER-COATED FIBERS, THE STEP OF IMPROVING THE DRAINAGE RATE OF SAID SLURRY BY ADDING FINELY DIVIDED ZINC OXIDE THERETO SUBSEQUENT TO THE ADDITION OF SAID AMMONIUM HYDROXIDE AND PRIOR TO THE ADDITION OF SAID SYNTHETIC RUBBER LATEX.
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) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |