Patent US3050084A successfully refreshed from Google Patents.
US3050084A
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Valve for controlling back pressure in plastic extruders
Assignee: Dow Chemical Co
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Filing: 1960-08-04
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Granted: 1962-08-21
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Expires: 1980-08-04
Abstract
No abstract record available.
Inventors
- 👤 Albert J Palfey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:13
CPC Classifications
F; F16; F16K; F16K35/00; F16K35/02; B; B29; B29C; B29C48/00; B29C48/25; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92019; B29C2948/92323; B29C2948/92361; B29C2948/9238; B29C2948/92504; B29C2948/92514; B29C2948/92819; B29C2948/92961; B29C48/03; Y; Y10; Y10S; Y10S425/00; Y10S425/224; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86743; Y10T137/86751
Claims Analysis
Total Claims: 0
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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) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |