US1656730A
Expired / Lapsed
US
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Delay valve
Assignee: HANNA ENGINEERING WORKS
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Filing: 1921-01-24
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Granted: 1928-01-17
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Expires: 1941-01-24
Abstract
No abstract record available.
Inventors
- 👤 John C Hanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:01
CPC Classifications
B; B21; B21J; B21J15/00; B21J15/10; B21J15/16; B21J15/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1931-01-16 | 1931-07-18 | 1932-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-01-16 | 1935-07-18 | 1936-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-01-16 | 1939-07-18 | 1940-01-17 | $7700.00 | Window Closed / Lapsed |