Patent US4330763A successfully refreshed from Google Patents.
US3448771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drain valve for tank bottom
Assignee: United States Steel Corp
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Filing: 1966-10-27
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Granted: 1969-06-10
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Expires: 1986-10-27
Abstract
No abstract record available.
Inventors
- 👤 John W Bales Jr
- 👤 Joseph S Giunta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:53
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/07; Y; Y10; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6606; Y10T137/8593; Y10T137/87917; Y10T137/87925
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |