US4908265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articles of manufacture and their production
Assignee: Imi Tech Corp
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Filing: 1989-07-31
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Granted: 1990-03-13
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Expires: 2009-07-31
Abstract
Abstract By compressing and heat curing a non-resilient, non-flexible recurable material formed by subjecting cured polyimide foam to the action of pressurized steam, a wide variety of useful articles may be produced. These include tough, flame-resistant plastic films, sheets, panels, boards, and shapes in general; composites (both reinforced and unreinforced); and laminates and other articles in which separate shapes or parts are bonded together by a new type of tough, flame-resistant adhesive. Additionally, heretofore worthless waste products such as the kerf cut away from buns of polyimide foam during the foam manufacturing process can be converted and vastly upgraded into any of such an array of new articles of manufacture such as those just mentioned.
Inventors
- 👤 Gregory A. Ferro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:44
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/14; C08J9/00; C08J9/36; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
37 words
A composite article produced by a process which comprises compressing and heat curing while interposed between a plurality of substrates a non-resilient, non-flexible recurable material formed by subjecting cured polyimide foam to the action of pressurized steam.
Claim 2
Dependent Claim
37 words
A composite article produced by a process which comprises compressing and heat curing while interposed between a plurality of substrates a non-resilient, non-flexible recurable material formed by subjecting cured polyimide foam to the action of pressurized steam.
Claim 3
Dependent Claim
43 words
A composite article produced by the process of claim 1 wherein the cured polyimide foam from which the recurable material was formed was a polyimide formed from a polyimide precursor composed predominantly of 3,3',4,4'-benzophenone tetracarboxylic acid lower alkyl ester, 4,4'-methylenedianiline and a diaminopyridine.
Claim 4
Dependent Claim
28 words
A composite article produced by the process of claim 1 such that the resultant compressed and cured substance between the substrate is cellular reinforced or filled cured polyimide.
Claim 5
Dependent Claim
27 words
A composite article produced by the process of claim 1 such that the resultant compressed and cured substance between the substrates is cellular unreinforced, unfilled cured polyimide.
Claim 6
Dependent Claim
28 words
A composite article produced by the process of claim 1 such that the resultant compressed and cured substance between the substrates is noncellular reinforced or filled cured polyimide.
Claim 7
Dependent Claim
27 words
A composite article produced by the process of claim 1 such that the resultant compressed and cured substance between the substrates is noncellular unreinforced, unfilled cured polyimide.
Claim 8
Dependent Claim
19 words
A process of claim 1 wherein said curable material is in subdivided or particulate form before it is compressed.
Claim 9
Dependent Claim
17 words
A process of claim 1 wherein said recurable material is in cellular form before it is compressed.
Claim 10
Dependent Claim
29 words
A process of claim 1 wherein said recurable material is in subdivided or particulate form and is in admixture with a subdivided or particulate filler before it is compressed.
Claim 11
Dependent Claim
14 words
A process of claim 1 wherein the compressing and heat curing are conducted sequentially.
Claim 12
Dependent Claim
14 words
A process of claim 1 wherein the compressing and heat curing are conducted concurrently.
Claim 13
Dependent Claim
29 words
A process of claim 1 wherein the compressing and heat curing are conducted sequentially and wherein said recurable material is in subdivided or particular form before it is compressed.
Claim 14
Dependent Claim
39 words
A process of claim 1 wherein the compressing and heat curing are conducted sequentially and wherein said recurable material is in subdivided or particulate form and is in admixture with a subdivided or particulate filler before it is compressed.
Claim 15
Dependent Claim
31 words
A process of claim 1 wherein the compressing and heat curing are conducted concurrently and wherein said recurable material is in subdivided or particulate form before it is compressed or heated.
Claim 16
Dependent Claim
40 words
A process of claim 1 wherein the compressing and heating are conducted concurrently and wherein said recurable material is in subdivided or particulate form and is in admixture with a subdivided or particulate filler before it is compressed or heated.
Claim 17
Dependent Claim
44 words
A process of claim 1 wherein the cured polyimide foam from which the recurable material was formed was a polyimide of (a) at least one aromatic tetracarboxylic acid or derivative thereof and (b) at least one aromatic or heterocyclic primary diamine, or combination thereof.
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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) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |