US2806721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stuffing box assembly
Assignee: JOHNSON FAGG ENGINEERING COMPA
•
Filing: 1953-10-12
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Granted: 1957-09-17
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Expires: 1973-10-12
Abstract
No abstract record available.
Inventors
- 👤 Leo W Fagg
- 👤 Chester L Sharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:06
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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DE639102C
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US2090956A
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US2193587A
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US2245007A
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US2372423A
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US2660458A
Cited
US2639198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |