Patent US2820252A successfully refreshed from Google Patents.
US2820252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of extrusion
Assignee: Polymer Corp
•
Filing: 1954-10-18
•
Granted: 1958-01-21
•
Expires: 1974-10-18
Abstract
No abstract record available.
Inventors
- 👤 Robert B Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:51
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/25; B29C48/30; B29C48/32; B29C48/34; D01D4/00; D01D4/02; D01D4/022; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A METHOD FOR FORMING ELONGATED SHAPES FROM POLYAMIDES, WHICH METHOD COMPRISES FORCING MOLTEN POLYAMIDE THROUGH A DIE FORMED OF POLYTETRAFLUOROETHYLENE FILLED WITH SILICA DIRECTLY INTO A WATER BATH CONTAINING A WETTING AGENT.
Claim 2
Independent Claim
32 words
A METHOD FOR FORMING ELONGATED SHAPES FROM POLYAMIDES, WHICH METHOD COMPRISES FORCING MOLTEN POLYAMIDE THROUGH A DIE FORMED OF POLYTETRAFLUOROETHYLENE FILLED WITH SILICA DIRECTLY INTO A WATER BATH CONTAINING A WETTING AGENT.
References Cited (Backward Citations)
US2324397A
Cited
US2403476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |