Patent US3394433A successfully refreshed from Google Patents.
US3394433A
Expired / Lapsed
US
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Apparatus for extruding plastic tubes with cross-ribbed surfaces
Assignee: Dow Chemical Co
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Filing: 1964-03-16
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Granted: 1968-07-30
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Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 Irving S Houvener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:09
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/345; B29C48/03; B29C48/09; B29C48/13; B29C48/16; B29C48/18; B29C48/21; B29C48/301; B29C48/32; B29C48/33; B29C48/335; B29C48/337; B29C48/338; B29C48/34; B29C48/10; B29L; B29L2028/00
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) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |