US2427636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve packing composition
Assignee: Shell Development Co
•
Filing: 1944-03-01
•
Granted: 1947-09-16
•
Expires: 1964-03-01
Abstract
No abstract record available.
Inventors
- 👤 William E Vaughan
- 👤 Hartwell C Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:57
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/20; F16J15/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1458574A
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US2119552A
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US2235438A
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US2258218A
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US2258219A
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US2258221A
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US2258220A
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US2258222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-15 | 1951-03-17 | 1951-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-15 | 1955-03-17 | 1955-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-15 | 1959-03-17 | 1959-09-16 | $7700.00 | Window Closed / Lapsed |