US2669217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for removal of excess spelter from the interior of larger sizes of conduitor the like by means of hot purging fluid
Assignee: Clifton Conduit Co Inc
•
Filing: 1949-05-05
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Granted: 1954-02-16
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Expires: 1969-05-05
Abstract
No abstract record available.
Inventors
- 👤 William S Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:20
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/14; C23C2/16; C23C2/18; C23C2/185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US177421A
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US606093A
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US956668A
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US1266140A
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US1806478A
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US1999559A
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US1982590A
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US2099723A
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US2408240A
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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) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |