US2931631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal assembly and method of operation
Assignee: Pfaudler Inc
•
Filing: 1954-10-28
•
Granted: 1960-04-05
•
Expires: 1974-10-28
Abstract
No abstract record available.
Inventors
- 👤 Edward S Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:32
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/03; F; F16; F16J; F16J15/00; F16J15/16; F16J15/162; F16J15/34; F16J15/38; F16J15/40; Y; Y10; Y10S; Y10S277/00; Y10S277/93
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US323749A
Cited
US706120A
Cited
US1201208A
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US1795311A
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GB319348A
Cited
US2226001A
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US2262526A
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US2382123A
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US2365791A
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GB570491A
Cited
US2432684A
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US2471317A
Cited
GB652443A
Cited
US2628852A
Cited
US2649318A
Cited
US2747001A
Cited
US2836440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |