Patent US4947141A successfully refreshed from Google Patents.
Patent US3596314A successfully refreshed from Google Patents.
US3596314A
Expired / Lapsed
US
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Apparatus for forming a densified fibrous article
Assignee: BP Chemicals Hitco Inc
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Filing: 1968-11-26
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Granted: 1971-08-03
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Expires: 1988-11-26
Abstract
Abstract A shaped article is formed from a preformed fibrous felt by densifying the felt between male and female die members, the outer surface of one of the die members being provided with a plurality of restraining edges which prevent the felt from slippage during the densification. As the article is subjected to substantial compression and densification, its ignition characteristics, dimensional stability, water absorption and strength characteristics are significantly improved while structural integrity during the densifying step is maintained.
Inventors
- 👤 Arthur Krugler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:22
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/18; F42B5/188; D; D21; D21J; D21J3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The molding assembly of claim 1 which includes means for heating at least one of the mold members.
Claim 2
Dependent Claim
28 words
The molding assembly of claim 1 which additionally comprises vacuum means for drawing a vacuum from the surface of at least one mold member to the interior thereof.
Claim 3
Dependent Claim
39 words
The molding assembly of claim 3 wherein the vacuum means comprises a plurality of grooves displaced along the surface of the mold member from whose surface said vacuum is drawn, said grooves being in communication with said vacuum means.
Claim 4
Dependent Claim
36 words
A molding assembly of claim 1 in which the surface discontinuities comprise a plurality of circumferential restraining edges successively disposed along the longitudinal axis of the surface of one mold member facing the other mold member.
Claim 5
Dependent Claim
255 words
A molding assembly for providing an extremely high density, deep drawn and tapered fibrous article comprising the combination of: a female mold member having an internal configuration corresponding to that desired for the outer surface of the deep drawn article; means coupled to said female mold member for longitudinally advancing said female mold member along a central longitudinal axis; a male mold member disposed concentric with the longitudinal central axis and in nesting relation within the concavity of said female mold member, said male mold member having a general outer surface configuration corresponding to the interior surface of said article, and further including surface grooves therein extending generally parallel to said longitudinally axis; said male mold member tapering upwardly; an apertured screen member encompassing and in contact with the exterior of said male mold member, said apertured screen member having a plurality of apertures extending therethrough, and communicating with the grooves in said male mold member, said screen member further including a plurality of circumferential discontinuities successively disposEd along the longitudinal axis on the side facing said female mold member, said discontinuities comprising successive steps tapering in the direction of the narrow end of said mold member, said steps including an edge radially disposed relative to the central axis and a relatively long base portion disposed parallel relative to said longitudinal axis; means in communication with said grooves for drawing a substantial vacuum within said grooves during closure of said female mold member toward said male mold member; and means for heating the mold members.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |