US2449355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal two-zone heat control for plastics extruders
Assignee: Dow Chemical Co
•
Filing: 1947-07-28
•
Granted: 1948-09-14
•
Expires: 1967-07-28
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Wiley
- 👤 Edward V Dettmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:07
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/875; B29C48/80; B29C48/84; B29C48/845; B29C48/36; B29C48/50; B29C48/505; B29C48/51; B29C48/515; B29C48/03; B29C48/09
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) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |