US3380129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion die for drain tile cluster
Assignee: RICHLAND SHALE PRODUCTS CO
•
Filing: 1966-06-29
•
Granted: 1968-04-30
•
Expires: 1986-06-29
Abstract
No abstract record available.
Inventors
- 👤 George M Magruder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:55
CPC Classifications
B; B28; B28B; B28B3/00; B28B3/20; B28B3/26; Y; Y10; Y10S; Y10S425/00; Y10S425/109
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1873445A
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US1508773A
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US1738665A
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US1849431A
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US1976858A
Cited
US2230309A
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FR928401A
Cited
US2908037A
Cited
US3038201A
Cited
US2875497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |