US5180751B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene foam sheets
Assignee: Fort James Corp
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Filing: 1992-05-22
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Granted: 1999-09-28
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Expires: 2012-05-22
Abstract
Abstract A thermoformable, rigid or semi-rigid polypropylene foam sheet having a smooth surface and a uniform cell structure and a density of at least 2.5 lbs/ft3 is prepared by extruding a mixture of a nucleating agent, a physical blowing agent and a polypropylene resin having a high melt strength and high melt elasticity.
Inventors
- 👤 John J Park
- 👤 Leon Katz
- 👤 Norman G Gaylord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J9/04; C08J9/12; C08J9/14; C08J9/141; B; B29; B29C; B29C48/00; B29C48/16; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B32B27/30; B32B27/304; B32B27/32; B32B27/34; B32B5/00; B32B5/18; C08J5/00; C08J5/18; C08J9/0066; C08J9/143; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2323/00; B32B2323/04; B32B2327/00; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249982; Y10T428/249987; Y10T428/249988; Y10T428/249989; Y10T428/249991; Y10T428/249992
Claims Analysis
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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) | 2002-09-27 | 2003-03-29 | 2003-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-27 | 2007-03-29 | 2007-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-27 | 2011-03-29 | 2011-09-28 | $7700.00 | Window Closed / Lapsed |