Patent US3280847A successfully refreshed from Google Patents.
US3280847A
Expired / Lapsed
US
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Extrusion die
Assignee: Dow Chemical Co
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Filing: 1961-09-19
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Granted: 1966-10-25
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Expires: 1981-09-19
Abstract
No abstract record available.
Inventors
- 👤 Douglas S Chisholm
- 👤 John J Grebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:13
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/53; B29C48/03; B29C48/06; B29C48/09; B29C48/12; B29C48/13; B29C48/30; B29C48/305; B29C48/32; B29C48/325; B29C48/34; B29C48/07; B29C48/08; B29C48/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A CONTINUOUS EXTRUDATE HAVING INTEGRAL REPETITIVE PROTUBERANCES FORMED ON ITS SURFACE THROUGH PLASTIC MEMORY.
Claim 2
Dependent Claim
14 words
A CONTINUOUS EXTRUDATE HAVING INTEGRAL REPETITIVE PROTUBERANCES FORMED ON ITS SURFACE THROUGH PLASTIC MEMORY.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |