Patent US2684729A successfully refreshed from Google Patents.
Patent US3584090A successfully refreshed from Google Patents.
US3584090A
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Process for producing an ultramicrocellular structure by extruding a crystalline polymer solution containing an inflatant
Assignee: Ametek Aerospace Products Inc
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Filing: 1968-01-08
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Granted: 1971-06-08
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Expires: 1988-01-08
Abstract
Abstract AN ULTRAMICROCELLULAR STRUCTURE, THE CELLS OF WHICH CONTAIN AN INFLATANT WHOSE PERMEABILITY COEFFICIENT FOR DIFFUSION THROUGH THE CELL WALLS IS LESS THAN THAT OF AIR, CAN BE OBTAINED BY FLASH-EXTRUDING A SOLUTION OF A POLYMER IN AN ACTIVATING LIQUID, WHICH SOLUTION ALSO CONTAINS THE INFLATANT. UPON EXTRUSION, THE CELLS OF THE STRUCTURE ARE PARTIALLY COLLAPSED BUT UNRUPTURED. UPON EXPOSURE TO AIR THE STRUCTURE SELF-INFLATES DUE TO DIFFUSION OF AIR INTO THE CELLS.
Inventors
- 👤 Robert Guy Parrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:19
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; C; C08; C08J; C08J9/00; C08J9/04; C08J9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |