US3642974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of moldings of polylactams by activated anionic polymerization of lactams
Assignee: BASF SE
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Filing: 1970-07-02
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Granted: 1972-02-15
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Expires: 1990-07-02
Abstract
Abstract A PROCESS FOR THE MANUFACTURE OF POLYAMIDE MOLDINGS BY ACTIVATED ANIONIC POLYMERIZATION OF LACTAMS IN A COMPRESSION MOLD HEATED TO THE TEMPERATURE OF POLYMERIZATION AND PROVIDED WITH A PLUNGER, THE PROCESS COMPRISING CHARGING THE MOLD WITH A MELT OF LACTAM, ACTIVATOR AND CATALYST IN AN AMOUNT SUCH AS IN REQUIRED FOR THE PRODUCTION OF THE MOLDING, IMMERSING THE PLUNGER IN THE MELT SO THAT THE LATTER COMPLETELY FILLS THE MOLD, COMPENSATING FOR CONTRACTION OF THE MELT DURING POLYMERIZATION BY ADVANCING THE PLUNGER WITHOUT APPLYING PRESSURE TO THE MELT, AND, WHEN NO FURTHER CONTRACTION TAKES PLACE, CLOSING THE MOLD UNDER PRESSURE AND THUS GIVING THE POLYMER ITS FINAL SHAPE.
Inventors
- 👤 Hans-Rudolf Jacobi
- 👤 Abel Hauser
- 👤 Manfred Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:21
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; B; B29; B29C; B29C39/00; B29C39/003; B29C39/006; B29C39/22; B29C39/40; B29K; B29K2077/00; B29K2105/00; B29K2105/0002
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |