US5049591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shape memory polymer foam
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1989-09-28
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Granted: 1991-09-17
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Expires: 2009-09-28
Abstract
Abstract A shape memory polymer foam which takes on a deformed shape and an as-molded shaped, said deformed shape being produced when the polymer foam is compressed at a temperature higher than the glass transition point (Tg) of the polymer and then kept compressed at a temperature lower than the Tg until compression sets, said as-molded shape being produced when the compressed polymer foam is heated again to a temperature higher than the Tg until it recovers its original shape.
Inventors
- 👤 Shunichi Hayashi
- 👤 Hiroshi Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:39
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/06; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C61/00; B29C61/003; B29K; B29K2075/00; B29K2105/00; B29K2105/04; C08G2110/00; C08G2110/0008; C08G2250/00; C08G2280/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
A shape memory polyurethane polymer foam which takes on a deformed shape and an as-molded shape, said deformed shape being produced when the polymer foam is compressed at a temperature higher than the glass transition point of the polymer and then kept compressed at a temperature lower than the glass transition point until compression sets, said as-molded shape being produced when the compressed polymer foam is heated again to a temperature higher than the glass transition point until it recovers its original shape.
Claim 2
Dependent Claim
83 words
A shape memory polyurethane polymer foam which takes on a deformed shape and an as-molded shape, said deformed shape being produced when the polymer foam is compressed at a temperature higher than the glass transition point of the polymer and then kept compressed at a temperature lower than the glass transition point until compression sets, said as-molded shape being produced when the compressed polymer foam is heated again to a temperature higher than the glass transition point until it recovers its original shape.
Claim 3
Dependent Claim
88 words
A shape memory polymer foam as claimed in claim 1, which is a polyurethane foam produced by the prepolymer process from a compound composed of a difunctional diisocyanate, a difunctional polyol, and a difunctional chain extender containing active hydrogen, whose molar ratio is 2.00-1.10:1.00:1.00-0.10, and a blowing agent, said polyurethane containing approximately equal amounts of isocyanate groups and hydroxyl groups at the terminals of the polymer chains, and having a glass transition point in the range of -50° to 60° C. and a crystallinity of 3-50 wt %.
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) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |