Patent US2399656A successfully refreshed from Google Patents.
US2399656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Float
Assignee: Individual
•
Filing: 1944-12-07
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Granted: 1946-05-07
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Expires: 1964-12-07
Abstract
No abstract record available.
Inventors
- 👤 Edward R Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:51
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/027; B; B63; B63B; B63B21/00; B63B21/50; B63B21/502; E21; E21B; E21B15/00; E21B15/003; B63B2021/505
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) | 1949-05-06 | 1949-11-05 | 1950-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-05-06 | 1953-11-05 | 1954-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-05-06 | 1957-11-05 | 1958-05-07 | $7700.00 | Window Closed / Lapsed |