Patent US3920511A successfully refreshed from Google Patents.
US3920511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-woven papermakers felt
Assignee: Albany International Corp
•
Filing: 1973-07-16
•
Granted: 1975-11-18
•
Expires: 1993-07-16
Abstract
Abstract An improved non-woven papermakers felt and economical method of manufacturing the same in which a base fabric is formed of a plurality of layers of webs formed of fibers oriented substantially longitudinally consolidated into a homogeneous mass and a web of fibers is needled thereinto.
Inventors
- 👤 Lowell G Grieves
- 👤 William S Wightman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:06
CPC Classifications
D; D04; D04H; D04H18/00; D04H1/00; D04H1/70; D04H1/74; D04H18/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A NON-WOVEN PAPERMAKERS FELT WHICH COMPRISES A SUBSTRATE FORMED OF A PLURALITY OF LAPPED LAYERS OF WEBS OF FIBERS ORIENTED SUBSTANTIALLY IN THE DIRECTION OF FELT TRAVEL AND WHICH HAVE BEEN CONSOLIDATED INTO A HOMOGENEOUS MASS IN THE ADSENCE OF BONDING AND STITCHING BY CONSECUTIVE NEEDLING OPERATIONS WHEREIN THE WEIGHT OF THE SUBSTRATE IS WITHIN THE RNAGE OF 180 GRAINS PER SQUARE FOOT TO 225 GRAINS PER SQUARE FOOT; AND A WEB OF FIBERS NEEDLED INTO SAID SUBSTRATE SUBSTANTIALLY CROSSWISE OF SAID FELT TRAVEL.
Claim 2
Dependent Claim
84 words
A NON-WOVEN PAPERMAKERS FELT WHICH COMPRISES A SUBSTRATE FORMED OF A PLURALITY OF LAPPED LAYERS OF WEBS OF FIBERS ORIENTED SUBSTANTIALLY IN THE DIRECTION OF FELT TRAVEL AND WHICH HAVE BEEN CONSOLIDATED INTO A HOMOGENEOUS MASS IN THE ADSENCE OF BONDING AND STITCHING BY CONSECUTIVE NEEDLING OPERATIONS WHEREIN THE WEIGHT OF THE SUBSTRATE IS WITHIN THE RNAGE OF 180 GRAINS PER SQUARE FOOT TO 225 GRAINS PER SQUARE FOOT; AND A WEB OF FIBERS NEEDLED INTO SAID SUBSTRATE SUBSTANTIALLY CROSSWISE OF SAID FELT TRAVEL.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |