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Patent US3519309A successfully refreshed from Google Patents.
US3519309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary cone bit retained by captive keeper ring
Assignee: Kennametal Inc
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Filing: 1965-08-12
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Granted: 1970-07-07
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Expires: 1985-08-12
Abstract
No abstract record available.
Inventors
- 👤 Edgar W Engle
- 👤 Robert D Goodfellow Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:23
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/19; E21C35/197; E21C35/183; E21C35/1831; E21C35/184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1550669A
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US2121202A
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US2610049A
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US3027953A
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US3232088A
Cited
US3268260A
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US3342531A
Cited
US3342532A
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US3331637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |