US3602931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Felted, fibrous, thermoplastic sheet fiberboard for molding rigid shoe components and method of making said components therefrom
Assignee: GEORGE O JENKINS CO
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Filing: 1969-03-05
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Granted: 1971-09-07
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Expires: 1989-03-05
Abstract
Abstract 25 A thermoplastic fiberboard for molding while hot on the last or on a metal form, rigid shoe components, such as counters, box toes and shanks, particularly counters, and consisting essentially of water-laid, felted paper fibers having dispersed therethrough fine particles of hard thermoplastic resin. The fiberboard and resin are moldable at a temperature between 130* F. and 170* F. but the resin is not sufficiently flowable at that temperature for the resin particles to flow together into a homogeneous mass. The maximum and minimum ratios of fiber to resin are 70/30 and 50/50, respectively, and the resin is a mixture of rosin and hard tall oil pitch resin in a ratio of between 70/30 and 40/60. The fiberboard of the invention has the favorable moldability characteristics of resin saturated fabrics now used to mold such shoe parts on the last or on a metal form, but, unlike such saturated fabrics, has the hardness, toughness, strength and resistance to crushing and breakdown characteristics of counterboard, which has been conventionally used to make such shoe parts, but the moldability characteristics of which are too poor to permit molding the shoe part on the last.
Inventors
- 👤 David James Macarthur
- 👤 Lawrence S Reed Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:38
CPC Classifications
A; A43; A43B; A43B23/00; A43B23/08; A43B23/16
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
25 words
A blank according to claim 1, said resin being insufficiently flowable at said temperature for said particles to flow together to form a homogeneous matrix.
Claim 2
Dependent Claim
29 words
A blank according to claim 1, said molding temperature being below the Ring and Ball Softening Point of said resin, the minimum ratio of fiber to resin being 50/50.
Claim 3
Dependent Claim
26 words
A blank according to claim 1, said resin having a Ring and Ball Softening Point not more than 190* F. and not less than 170* F.
Claim 4
Dependent Claim
19 words
A blank according to claim 1, said resin comprising a mixture of hard tall oil pitch resin and rosin.
Claim 5
Dependent Claim
21 words
A blank according to claim 5, the minimum ratio by weight of fiber to resin mixture in said fiberboard being 50/50.
Claim 6
Dependent Claim
50 words
A blank according to claim 6, said tall oil pitch resin having a Ring and Ball Softening Point not greater than 225* F. and not less than 205* F., said resin mixture having a Ring and Ball Softening Point not greater than 190* F. and not less than 170* F.
Claim 7
Dependent Claim
21 words
A blank according to claim 6, the weight ratio of rosin to tall oil pitch resin being between 70/30 and 40/60.
Claim 8
Dependent Claim
15 words
A blank according to claim 8, having a coating of a dry heat sensitive adhesive.
Claim 9
Dependent Claim
27 words
A blank according to claim 6, the ratio of fiber to resin mixture being 60/40 and the ratio of rosin to tall oil pitch resin being 60/40.
Claim 10
Dependent Claim
162 words
In a method of making a shoe, the improvement comprising applying to a pArtly completed shoe to form an assembly for lasting, a blank for a rigid shoe part, said blank consisting essentially of a thermoplastic fiberboard of water-laid, felted nonmetallic fibers having dispersed therein particles of a hard ductile thermoplastic resin, the maximum and minimum ratio by weight of fiber to resin in said fiberboard being 70/30 and 50/50, respectively, heating said blank in said assembly to a molding temperature of between 130* F. and 170* F., applying said assembly to a last or a form having the approximate shape of the last, molding said blank in said assembly on said last or form to the shape of said part and cooling said molded blank in said assembly to below said molding temperature to form said part, said resin being insufficiently flowable during said molding operation at said molding temperature for said particles to flow together to form a homogeneous mass.
Claim 11
Dependent Claim
24 words
A method according to claim 11, the maximum and minimum Ring- and Ball-Softening Point of said resin being 190* F. and 170* F., respectively.
Claim 12
Dependent Claim
19 words
A method according to claim 11, said molding temperature being below the Ring- and Ball-Softening Point of said resin.
Claim 13
Dependent Claim
42 words
A method according to claim 11, said resin comprising a mixture of rosin and a hard tall oil pitch resin, said rosin being effective to lower the molding temperature of said tall oil pitch resin to said 130* F. to 170* F.
Claim 14
Dependent Claim
21 words
A method according to claim 14, the weight ratio of rosin to tall oil pitch resin being between 70/30 and 40/60.
Claim 15
Dependent Claim
27 words
A method according to claim 15, said resin and rosin being mixed while molten and chilled to solidification, said chilled mixture being ground into said resin particles.
Claim 16
Dependent Claim
31 words
A method according to claim 16, said chilled mixture being ground to a particle size at which at least the major portion of the particles pass through a 200 mesh screen.
Claim 17
Dependent Claim
47 words
A method according to claim 11, the amount of fiber by weight being greater than the amount of resin, said blank having a coating of a dry heat-sensitive adhesive which is effective to bond said blank in place in said partly finished shoe by said heating operation.
Claim 18
Dependent Claim
63 words
A thermoplastic fiberboard for a rigid shoe part consisting essentially of water-laid, dried felted nonmetallic fibers having dispersed therein fine particles of a hard ductile thermoplastic resin, said fiberboard and resin being moldable at a temperature of between 130* F. and 170* F., the maximum ratio by weight of fiber to resin being 70/30, said resin comprising a hard tall oil pitch resin.
Claim 19
Dependent Claim
30 words
A fiberboard according to claim 19, said resin comprising a mixture of hard tall oil pitch resin and rosin, the minimum weight ratio of fiber to resin mixture being 50/50.
Claim 20
Dependent Claim
21 words
A fiberboard according to claim 20, the weight ratio of rosin to tall oil pitch resin being between 70/30 and 40/60.
Claim 21
Dependent Claim
64 words
A fiberboard furnish comprising an aqueous dispersion of fibers and fine particles of a hard ductile thermoplastic resin, said resin comprising a mixture of a hard tall oil pitch resin and rosin, the maximum and minimum extracted weight ratio of fiber to resin mixture being 70/30 and 50/50, respectively, the weight ratio of rosin to tall oil pitch resin being between 70/30 and 40/60.
Claim 22
Independent Claim
106 words
A method of making a fiberboard comprising intimately mixing together molten tall oil pitch resin and molten rosin, chilling the molten mixture to solidification, grinding the solidified mixture to fine particles, adding the ground mixture and fibers to water to form an aqueous dispersion of said fibers and particles, the maximum extracted weight ratio of fibers to resin particles being 70/30, the weight ratio of rosin to tall oil pitch resin being between 70/30 and 40/60, reducing the pH of the dispersion to deposit the particles on the fibers forming a water-laid, felted sheet from said dispersion and drying said sheet without fusing together said particles.
Claim 23
Dependent Claim
77 words
A rigid shoe part, said part being made by heat molding a thermoplastic fiberboard blank consisting essentially of water-laid, dried, felted nonmetallic fibers having dispersed therethrough fine particles of a hard ductile thermoplastic resin, the maximum and minimum weight ratios of fiber to resin being 70/30 and 50/50, respectively, said part being heat molded at a fiberboard temperature of 130* F.-170* F., said resin being present in the shoe part in the form of a nonhomogeneous mass.
Claim 24
Dependent Claim
35 words
A shoe part according to claim 24, said resin consisting of a mixture of rosin and hard tall oil pitch resin, the weight ratio of the latter to the former being between 70/30 and 40/60.
Claim 25
Dependent Claim
13 words
A blank according to claim 1, wherein said shoe part is a counter.
Claim 26
Dependent Claim
23 words
A method according to claim 11, wherein said shoe part is a counter and said resin comprises a hard tall oil pitch resin.
Claim 27
Dependent Claim
60 words
A blank for a rigid shoe part, consisting essentially of a thermoplastic fiberboard of felted nonmetallic fibers having dispersed therethrough fine particles of a resin comprising a hard, ductile tall oil pitch resin, said fiberboard and resin being moldable at a temperature of between 130* F. and 170* F., the maximum ratio by weight of fiber to resin being 70/30.
Claim 28
Dependent Claim
16 words
A blank according to claim 28, said resin also including an extracted pine wood pitch resin.
Claim 29
Dependent Claim
18 words
A blank according to claim 29, said tall oil pitch-extracted pine wood pitch resin being mixed with rosin.
Claim 30
Dependent Claim
17 words
A blank according to claim 29, said tall oil pitch resin being a limed tall oil pitch.
Claim 31
Dependent Claim
19 words
A blank according to claim 1, the amount of fibers by weight being greater than the amount of resin.
Claim 32
Dependent Claim
20 words
A blank according to claim 6, the amount of fibers by weight being greater than the amount of resin mixture.
Claim 33
Dependent Claim
17 words
A blank according to claim 28, the minimum ratio by weight of fiber to resin being 50/50.
Claim 34
Dependent Claim
18 words
A method according to claim 23, the minimum extracted weight ratio of fibers to resin particles being 50/50.
Claim 35
Dependent Claim
157 words
In a method of making a shoe, the improvement comprising applying to a partly completed shoe to form an assembly for lasting, a blank for a rigid shoe part, said blank consisting essentially of a thermoplastic fiberboard of water-laid, felted nonmetallic fibers having dispersed therein particles of a hard ductile thermoplastic resin, the maximum ratio by weight of fiber to resin in said fiberboard being 70/30, heating said blank in said assembly to a molding temperature of between 130* F. and 170* F., applying said assembly to a last or a form having the approximate shape of the last, molding said blank in said assembly on said last or form to the shape of said part and cooling said molded blank in said assembly to below said molding temperature to form said part, said resin being insufficiently flowable during said molding operation at said molding temperature for said particles to flow together to form a homogeneous mass.
Claim 36
Dependent Claim
72 words
A rigid shoe part, said part being made by heat molding a thermoplastic fiberboard blank consisting essentially of water-laid, dried, felted nonmetallic fibers having dispersed therethrough fine particles of a hard ductile thermoplastic resin, the maximum weight ratio of fiber to resin being 70/30, said part being heat molded at a fiberboard temperature of 130* F.-170* F., said resin being present in the shoe part in the form of a nonhomogeneous mass.
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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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |