Patent US2634990A successfully refreshed from Google Patents.
US2634990A
Expired / Lapsed
US
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Mechanical sealing device
Assignee: Individual
•
Filing: 1950-07-22
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Granted: 1953-04-14
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Expires: 1970-07-22
Abstract
No abstract record available.
Inventors
- 👤 Charles A Fink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:46
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3404; F16J15/3408; F16J15/3412; F16J15/342; F16J15/3464; F16J15/3472; F16J15/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1167210A
Cited
US1927543A
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US2023206A
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US2365046A
Cited
US2383862A
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US2434458A
Cited
US2405464A
Cited
US2479711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |