Patent US3606636A successfully refreshed from Google Patents.
US3606636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion die
Assignee: Dow Chemical Co
•
Filing: 1969-09-30
•
Granted: 1971-09-21
•
Expires: 1989-09-30
Abstract
Abstract A MULTI-COMPONENT EXTRUSION DIE IS SHOWN WHICH IS PARTICULARLY SUITED FOR HANDLING CORROSIVE POLYMERS WHEREIN A CORROSIVE OR DEGRADABLE POLYMER IS ENCAPSULATED BY A COUNTERCURRENT FLOW OF AN ENCAPSULATING POLYMER.
Inventors
- 👤 Henry L Glass
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:31
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/16; B29C48/18; B29C48/305; B29C48/307; B29C48/33; B29C48/21
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |