Patent US2687552A successfully refreshed from Google Patents.
US2687552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for direct spinning of polyamides
Assignee: Inventa AG fuer Forschung und Patentverwertung
•
Filing: 1950-08-11
•
Granted: 1954-08-31
•
Expires: 1970-08-11
Abstract
No abstract record available.
Inventors
- 👤 Gabler Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:26
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; C; C08; C08G; C08G69/00; C08G69/46; D01D1/00; D01D1/10; D01D1/103; D01F; D01F6/00; D01F6/58; D01F6/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
AN APPARATUS FOR THE DIRECT SPINNING OF LIQUID POLYAMIDES OF OMEGA-AMINO CARBOXYLIC ACIDS CONTAINING ABOUT 8-15% OF UNPOLYMERIZED MONOMER, COMPRISING A SUBSTANTIALLY VERTICAL HEATING CHAMBER, FIRST PUMP MEANS DISCHARGING INTO SAID HEATING CHAMBER NEAR ITS UPPER END, EXHAUST MEANS CONNECTED TO SAID HEATING CHAMBER NEAR ITS UPPER END, A CONICAL SPREADING SURFACE POSITIONED WITHIN SAID HEATING CHAMBER WITH ITS APEX ADJACENT SAID FIRST PUMP MEANS AND ITS BASE REMOTE FROM SAID FIRST PUMP MEANS, HEATING MEANS POSITIONED BENEATH SAID CONICAL SURFACE, EXIT MEANS CONNECTED TO SAID CHAMBER NEAR ITS LOWER END, SECOND PUMP MEANS HAVING AN INLET
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |