Patent US4255133A successfully refreshed from Google Patents.
Patent US3790650A successfully refreshed from Google Patents.
US3790650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for compression molding of thermosetting plastics utilizing a temperature gradient across the plastic to cure the article
Assignee: National Aeronautics and Space Administration
•
Filing: 1971-11-15
•
Granted: 1974-02-05
•
Expires: 1991-11-15
Abstract
Abstract METHOD FOR COMPRESSION MOLDING OF THERMOSETTING PLASTICS COMPOSITIONS WHEREIN HEATL IS APPLIED TO THE COMPRESSED LOAD IN A MOLD CAVITY AND ADJUSTED TO HOLD MOLDING TEMPERATURE AT THE INTERFACE OF THE CAVITY SURFACE AND THE COMPRESSED COMPOUND TO PRODUCE A THERMAL FRONT. THIS THERMAL FRONT ADVANCES INTO THE EVACUATED COMPOUND AT MEAN RIGHT ANGLES TO THE COMPRESSION LOAD AND TOWARD A THERMAL FENCE FORMED AT THE OPPOSITE SURFACE OF THE COMPRESSED COMPOUND.
Inventors
- 👤 W Heier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:20
CPC Classifications
B; B29; B29C; B29C43/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |