US2727765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary mechanical seal
Assignee: Phillips Petroleum Co
•
Filing: 1952-01-02
•
Granted: 1955-12-20
•
Expires: 1972-01-02
Abstract
No abstract record available.
Inventors
- 👤 Myron O Kilpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:40
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US849576A
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US1618655A
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US2042691A
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US2148093A
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US2207371A
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US2244450A
Cited
US2258008A
Cited
US2277771A
Cited
GB591522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |