Patent US2770477A successfully refreshed from Google Patents.
US2770477A
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US
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Mechanical seal
Assignee: FMC Corp
•
Filing: 1951-07-30
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Granted: 1956-11-13
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Expires: 1971-07-30
Abstract
No abstract record available.
Inventors
- 👤 Dan R Rankin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:47
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/38; Y; Y10; Y10S; Y10S277/00; Y10S277/917; Y10S285/00; Y10S285/91; Y10S285/923
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1835877A
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US1904568A
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US2253969A
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US2446243A
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US2390892A
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US2395095A
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US2583867A
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US2525365A
Cited
US2554406A
Cited
US2494598A
Cited
US2615739A
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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) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |