US3393260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing foam products
Assignee: Baker Perkins Inc
•
Filing: 1965-04-27
•
Granted: 1968-07-16
•
Expires: 1985-04-27
Abstract
No abstract record available.
Inventors
- 👤 Richard W Miler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:45
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; B29B; B29B7/00; B29B7/74; B29B7/7404; B29B7/7409; B29B7/7414; B29B9/00; B29B9/02; B29B9/06; C; C08; C08J; C08J9/00; C08J9/16; Y; Y10; Y10S; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR MOLDING A THERMOPLASTIC RESIN AND A FOAMING AGENT INTO A DESIRED SHAPE COMPRISING THE STEPS OF: COMPACTING A MIXTURE OF PARTICLES OF SAID RESIN AND PARTICLES OF SAID FOAMING AGENT TO INCREASE THE BULK DENSITY THEREOF AND REMOVE THE GAS FROM BETWEEN THE PARTICLES OF RESIN AND AGENT AT A TEMPERATURE BELOW THE SOFTENING TEMPERATURE OF THE RESIN IMMEDIATELY; THEREAFTER INTRODUCING SAID MIXTURE UNDER FEEDING PRESSURE TO A MIXING AND KNEADING ZONE AND INTENSIVELY MIXING AND KNEADING THE RESIN AND AGENT BY MOVING PORTION THEREOF FORWARDLY AND REARWARDLY WITH RESPECT TO OTHER PORTIONS AT A TEMPERATURE HIGHER THAN THE SOFTENING TEMPERATURE OF THE RESIN AND UNDER TEMPERATURE AND PRESSURE CONDITIONS MAINTAINING THE FOAMING AGENT INACTIVE TO PRODUCE A HOMOGENEOUS MIXTURE; AND THEN EXTRUDING THE SOFTENED MIXTURE.
Claim 2
Dependent Claim
129 words
A PROCESS FOR MOLDING A THERMOPLASTIC RESIN AND A FOAMING AGENT INTO A DESIRED SHAPE COMPRISING THE STEPS OF: COMPACTING A MIXTURE OF PARTICLES OF SAID RESIN AND PARTICLES OF SAID FOAMING AGENT TO INCREASE THE BULK DENSITY THEREOF AND REMOVE THE GAS FROM BETWEEN THE PARTICLES OF RESIN AND AGENT AT A TEMPERATURE BELOW THE SOFTENING TEMPERATURE OF THE RESIN IMMEDIATELY; THEREAFTER INTRODUCING SAID MIXTURE UNDER FEEDING PRESSURE TO A MIXING AND KNEADING ZONE AND INTENSIVELY MIXING AND KNEADING THE RESIN AND AGENT BY MOVING PORTION THEREOF FORWARDLY AND REARWARDLY WITH RESPECT TO OTHER PORTIONS AT A TEMPERATURE HIGHER THAN THE SOFTENING TEMPERATURE OF THE RESIN AND UNDER TEMPERATURE AND PRESSURE CONDITIONS MAINTAINING THE FOAMING AGENT INACTIVE TO PRODUCE A HOMOGENEOUS MIXTURE; AND THEN EXTRUDING THE SOFTENED MIXTURE.
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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) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |