US3764645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding coated articles of fibrous materials
Assignee: Furnier und Sperrholzwerk JF Werz Jr KG Werzalit Pressholzwerk
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Filing: 1971-05-03
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Granted: 1973-10-09
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Expires: 1991-05-03
Abstract
Abstract A method of press-molding sheet-coated articles especially of a platelike shape from a mixture of comminuted fibrous materials and a thermosetting binder by impressing conical or similar recesses in the normally lower side of the material for increasing especially during the hot-molding operation the rate of compression of the material within the marginal areas and especially the corner areas of the fibrous body of the article so as to prevent any shrinkage of the material while it is setting and thereby to insure that the covering sheet material will be firmly bonded to the fibrous body especially within these areas. The projections on the molding die for impressing the recesses also act as gripping means to prevent the shrinking of the material.
Inventors
- 👤 E Munk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:43
CPC Classifications
B; B27; B27N; B27N5/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
204 words
A method of making from a mixture of comminuted fibrous material and a thermosetting binder a substantially plate-like polygonal element having a top face, a bottom face and a plurality of side faces extending at angles relative to each other and defining a plurality of edges and corners of said element, comprising: a. press-molding from said mixture said element under application of heat and pressure thereto with a thin cover sheet applied to respective faces thereof; b. compressing said element while activating said thermosetting binder and simultaneously impressing into said element along edges of said bottom face thereof recess means having a predetermined depth and extending parallel to the respective edges, and in the region of each corner thereof a corner recess opening in said bottom face and tapering in direction towards said top face substantially to a point and having a depth greater than said predetermined depths of said recess means; and c. maintaining the thus compressed and impressed element in compressed condition at least until said activated thermosetting binder has set so as to bond said fibrous material and said cover sheet thereto and to prevent shrinkage of said element in said corner regions thereof during said setting of said thermosetting binder.
Claim 2
Independent Claim
204 words
A method of making from a mixture of comminuted fibrous material and a thermosetting binder a substantially plate-like polygonal element having a top face, a bottom face and a plurality of side faces extending at angles relative to each other and defining a plurality of edges and corners of said element, comprising: a. press-molding from said mixture said element under application of heat and pressure thereto with a thin cover sheet applied to respective faces thereof; b. compressing said element while activating said thermosetting binder and simultaneously impressing into said element along edges of said bottom face thereof recess means having a predetermined depth and extending parallel to the respective edges, and in the region of each corner thereof a corner recess opening in said bottom face and tapering in direction towards said top face substantially to a point and having a depth greater than said predetermined depths of said recess means; and c. maintaining the thus compressed and impressed element in compressed condition at least until said activated thermosetting binder has set so as to bond said fibrous material and said cover sheet thereto and to prevent shrinkage of said element in said corner regions thereof during said setting of said thermosetting binder.
Claim 3
Dependent Claim
17 words
A method as defined in claim 1 wherein each of said corner recesses has a conical shape.
Claim 4
Dependent Claim
22 words
A method as defined in claim 1 wherein each of said corner recesses has a pyramidal shape having at least three sides.
Claim 5
Dependent Claim
40 words
A method as defined in claim 1 wherein each of said corner recesses is impressed into said element so as to have at said bottom face a dimension greater than the width of said recess means at said bottom face.
Claim 6
Dependent Claim
19 words
A method as defined in claim 1 wherein said recess means are impressed in the form of elongated grooves.
Claim 7
Dependent Claim
24 words
A method as defined in claim 5 wherein said grooves are impressed in such a manner that they end short of said corner recesses.
Claim 8
Dependent Claim
22 words
A method as defined in claim 5 wherein said grooves are impressed in such a manner that they intersect said corner recesses.
Claim 9
Dependent Claim
21 words
A method as defined in claim 1 wherein said recess means are in the form of a row of consecutive recesses.
Claim 10
Dependent Claim
17 words
A method as defined in claim 8 wherein each of said consecutive recesses has a conical shape.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |