US3346445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Press packing sheet of a fibrous web impregnated with polyurethane and method of making same
Assignee: Hillingsworth and Vose Co
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Filing: 1964-12-01
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Granted: 1967-10-10
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Expires: 1984-12-01
Abstract
No abstract record available.
Inventors
- 👤 Philip T Gay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:54
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/57
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE PROCESS OF MAKING A PRESS PACKING SHEET INCLUDING THE STEPS OF: FORMING A POROUS FIBROUS WEB HAVING A BULK FACTOR IN THE RANGE OF 3 TO 9 POUNDS PER POINT FROM A FREE DRAINING FIBER FURNISH HAVING A ROGERS FREENESS VALUE FROM 5 TO 40 SECONDS; DRYING THE WEB; IMPREGNATING THE WEB WITH 50 TO 150 PARTS BY WEIGHT OF A POLYURETHANE PREPOLYMER TO 100 PARTS OF THE WEB; AND, CURING THE IMPREGNATED WEB TO CROSS-LINK THE POLYURETHANE PREPOLYMER AND BOND IT TO THE WEB.
Claim 2
Dependent Claim
86 words
THE PROCESS OF MAKING A PRESS PACKING SHEET INCLUDING THE STEPS OF: FORMING A POROUS FIBROUS WEB HAVING A BULK FACTOR IN THE RANGE OF 3 TO 9 POUNDS PER POINT FROM A FREE DRAINING FIBER FURNISH HAVING A ROGERS FREENESS VALUE FROM 5 TO 40 SECONDS; DRYING THE WEB; IMPREGNATING THE WEB WITH 50 TO 150 PARTS BY WEIGHT OF A POLYURETHANE PREPOLYMER TO 100 PARTS OF THE WEB; AND, CURING THE IMPREGNATED WEB TO CROSS-LINK THE POLYURETHANE PREPOLYMER AND BOND IT TO THE WEB.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |