Patent US3445890A successfully refreshed from Google Patents.
US3445890A
Expired / Lapsed
US
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Two-stage extruder
Assignee: NRM Corp
•
Filing: 1966-12-08
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Granted: 1969-05-27
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Expires: 1986-12-08
Abstract
No abstract record available.
Inventors
- 👤 Eugene E Heston
- 👤 John F Stroup
- 👤 William S Mccormick
- 👤 Heinrich J Wurgler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:24
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/64; B29C48/65; B29C48/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123860A
Cited
US3023456A
Cited
FR1251409A
Cited
US3248469A
Cited
US3271819A
Cited
GB1012766A
Cited
US3300810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |