US4981745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming fabric for papermaking
Assignee: Individual
•
Filing: 1989-05-26
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Granted: 1991-01-01
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Expires: 2009-05-26
Abstract
Abstract An improved forming fabric for papermaking has discrete projections on the sheet forming side to improve fines retention and on the machine contact side, for improved resistance to wear.
Inventors
- 👤 Leonard R. Lefkowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/30; D21F1/0027; Y; Y10; Y10S; Y10S162/00; Y10S162/903; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24405; Y10T428/25; Y10T428/254
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
An improved forming fabric with enhanced particle arresting means for a papermaking machine, said forming fabric comprising a base fabric layer having a paper contact surface, wherein the improvement comprises a plurality of spaced apart discrete particles adhered to said paper contact surface.
Claim 2
Dependent Claim
43 words
An improved forming fabric with enhanced particle arresting means for a papermaking machine, said forming fabric comprising a base fabric layer having a paper contact surface, wherein the improvement comprises a plurality of spaced apart discrete particles adhered to said paper contact surface.
Claim 3
Dependent Claim
41 words
An improved wear resistant forming fabric for a papermaking machine, said forming fabric comprising a base fabric layer having a machine contact surface, wherein the improvement comprises a plurality of discrete spaced apart particles adhered to said machine side contact surface.
Claim 4
Dependent Claim
41 words
An improved wear resistant forming fabric for a papermaking machine, said forming fabric comprising a base fabric layer having a machine contact surface, wherein the improvement comprises a plurality of discrete spaced apart particles adhered to said machine side contact surface.
Claim 5
Dependent Claim
26 words
The forming fabric of claim (1) or claim (2) where the average size of the particles is in the range of from 15 to 125 micrometers.
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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |