Patent US4879081A successfully refreshed from Google Patents.
US4879081A
Expired / Lapsed
US
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Process of making fused, oriented-grain polymeric materials
Assignee: Eastman Chemical Co
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Filing: 1988-07-15
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Granted: 1989-11-07
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Expires: 2008-07-15
Abstract
Abstract A process for producing a thermoplastic material including the steps of molecularly orienting a thermoplastic material, grinding the oriented material to a particle size between about 0.01 to 10 mm and fusing the ground particulate material to substantially mutually adhere the particles thereby producing a sintered thermoplastic material. The fused product includes discrete fused particles of one or more anisotropically oriented thermoplastic polymers and exhibits isotropic increases in flexural modulus.
Inventors
- 👤 Gerald T. Keep
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:02
CPC Classifications
B; B29; B29C; B29C69/00; B29C69/02; B29C67/00; B29C67/02; B29C67/04; B29C2791/00; B29C2791/004; B29C2791/006; B29K; B29K2101/00; B29K2101/12; B29K2105/00; B29K2105/25; B29K2105/251; B29K2995/00; B29K2995/0037; B29K2995/0044; B29K2995/0045; B29K2995/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A process for producing a fused thermoplastic material, comprising the steps of: (i) molecularly orienting a thermoplastic material; (ii) grinding said oriented material to produce a ground particulate material having a particle size between about 0.01 to 10 mm; and (iii) fusing said ground particulate material at a temperature sufficient to substantially mutually adhere said particles, but low enough to prevent loss of orientation of said thermoplastic material, thereby producing said thermoplastic material.
Claim 2
Dependent Claim
73 words
A process for producing a fused thermoplastic material, comprising the steps of: (i) molecularly orienting a thermoplastic material; (ii) grinding said oriented material to produce a ground particulate material having a particle size between about 0.01 to 10 mm; and (iii) fusing said ground particulate material at a temperature sufficient to substantially mutually adhere said particles, but low enough to prevent loss of orientation of said thermoplastic material, thereby producing said thermoplastic material.
Claim 3
Dependent Claim
22 words
The process of claim 1, wherein said oriented material is ground to a particle size of about 0.1 to about 3 mm.
Claim 4
Dependent Claim
22 words
The process of claim 1, wherein said oriented material is ground to a particle size of about 0.5 to about 2 mm.
Claim 5
Dependent Claim
15 words
The process of claim 1, wherein said orienting and said grinding steps are conducted simultaneously.
Claim 6
Dependent Claim
17 words
The process of claim 1, wherein said fusing step is conducted in the presence of a vacuum.
Claim 7
Dependent Claim
54 words
A process for providing a fused thermoplastic material, which comprises fusing ground particulate molecularly oriented material at a temperature sufficient to substantially mutually adhere said particles, but low enough to prevent loss of orientation of said thermoplastic material, wherein said particles have a particle size in the range of about 0.01 to 10 mm.
Claim 8
Dependent Claim
54 words
A process for providing a fused thermoplastic material, which comprises fusing ground particulate molecularly oriented material at a temperature sufficient to substantially mutually adhere said particles, but low enough to prevent loss of orientation of said thermoplastic material, wherein said particles have a particle size in the range of about 0.01 to 10 mm.
Claim 9
Dependent Claim
17 words
The process of claim 6, wherein said fusing step is conducted in the presence of a vacuum.
Claim 10
Dependent Claim
59 words
A process for producing a fused, thermoplastic material, which comprises: (i) grinding molecularly oriented thermoplastic material to produce ground particulate material having a particle size between 0.01 to 10 mm, then (ii) fusing said ground particulate material at a temperature sufficient to substantially mutually adhere said particles, but low enough to prevent loss of orientation of said thermoplastic material.
Claim 11
Dependent Claim
59 words
A process for producing a fused, thermoplastic material, which comprises: (i) grinding molecularly oriented thermoplastic material to produce ground particulate material having a particle size between 0.01 to 10 mm, then (ii) fusing said ground particulate material at a temperature sufficient to substantially mutually adhere said particles, but low enough to prevent loss of orientation of said thermoplastic material.
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) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |