US2790859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1954-08-23
•
Granted: 1957-04-30
•
Expires: 1974-08-23
Abstract
No abstract record available.
Inventors
- 👤 Tseng Hung-Tu
- 👤 Miao Yun Tai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:47
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/72; H01H13/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1977124A
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US2144705A
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US2217395A
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US2203279A
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US2457153A
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US2623958A
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US2572622A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |