Patent US637821A successfully refreshed from Google Patents.
Patent US2821721A successfully refreshed from Google Patents.
US2821721A
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US
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Tank discharge valve mounting
Assignee: Crane Co
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Filing: 1955-02-21
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Granted: 1958-02-04
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Expires: 1975-02-21
Abstract
No abstract record available.
Inventors
- 👤 Axel B Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:15
CPC Classifications
E; E03; E03D; E03D1/00; E03D1/30; E03D1/304; E03D1/306
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US419566A
Cited
US1201416A
Cited
US2512694A
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US1925748A
Cited
US2121362A
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US2142393A
Cited
US2598967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |