US3703571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of casting rigid foam to support a hollow flexible plastic shell
Assignee: Individual
•
Filing: 1971-05-10
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Granted: 1972-11-21
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Expires: 1991-05-10
Abstract
Abstract PROCESS FOR PREPARING RIGID, IMPACT-RESISTANT ARTICLE COMPRISING A HOLLOW OUTER SHELL COMPONENT AND AN INNER RIGIDIFIER COMPONENT COMPRISING A CELLULAR PLASTICS MATERIAL. THE ARTICLE IS FORMED BY MOLDING THE HOLLOW FLEXIBLE SHELL COMPONENT, REMOVING THE MOLDED SHELL COMPONENT FROM ITS MOLD, INTRODUCING A FOAMABLE ORGANIC PLASTIC INTO THE SHELL AND ALLOWING IT TO FOAM AND SOLIDIFY INTO A RIGID FOAM IN CONTACT WITH THE ENTIRE INNER SURFACE OF THE FLEXIBLE SHELL.
Inventors
- 👤 Arthur H Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:16
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/18; B29L; B29L2031/00; B29L2031/722; B29L2031/747; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/31504; Y10T428/31507; Y10T428/31511; Y10T428/31551; Y10T428/31554; Y10T428/31786; Y10T428/31826; Y10T428/31855; Y10T428/31859; Y10T428/31942
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |