US3651008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric compositions and their method of manufacture
Assignee: National Aeronautics and Space Administration
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Filing: 1967-12-22
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Granted: 1972-03-21
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Expires: 1987-12-22
Abstract
Abstract FILLED POLYMER COMPOSITIONS MADE BY DISSOLVING THE POLYMER BINDER IN A SUITABLE SUBLIMABLE SOLVENT, MIXING THE FILLER MATERIAL WITH THE POLYMER AND ITS SOLVENT, FREEZING THE RESULTING MIXTURE, AND SUBLIMING THE FROZEN SOLVENT FROM THE MIXTURE, REMOVING IT THEREFROM. THE REMAINING COMPOSITION IS THEN SUITABLE FOR CONVENTIONAL PROCESSING, SUCH AS COMPRESSION MOLDING OR EXTRUDING. A PARTICULAR FEATURE OF THE METHOD OF MANUFACTURE IS POURING THE MIXED SOLUTION SLOWLY IN A CONTINUOUS STREAM INTO A CRYOGENIC BATH WHEREIN FROZEN PARTICLES OF THE MIXTURE RESULT. THE FROZEN INDIVIDUAL PARTICLES ARE THEN SUBJECTED TO THE SUBLIMATION.
Inventors
- 👤 Billy G Moser
- 👤 Robert F Landel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:57
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/002; C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/212
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |