Patent US2489936A successfully refreshed from Google Patents.
US2489936A
Expired / Lapsed
US
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Seal assembly for gyratory crushers
Assignee: Nordberg Manufacturing Co
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Filing: 1947-06-09
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Granted: 1949-11-29
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Expires: 1967-06-09
Abstract
No abstract record available.
Inventors
- 👤 Ruland R Shafter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:32
CPC Classifications
B; B02; B02C; B02C2/00; B02C2/02; B02C2/04; B02C2/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1660589A
Cited
US744636A
Cited
US1791584A
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US2000385A
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US2054326A
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US2148682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |