US2779306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroscopic toner metering device
Assignee: International Business Machines Corp
•
Filing: 1955-03-25
•
Granted: 1957-01-29
•
Expires: 1975-03-25
Abstract
No abstract record available.
Inventors
- 👤 Harry L Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; G03G15/0887; G03G15/0891; G03G15/0877
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US553305A
Cited
US1659179A
Cited
US2279361A
Cited
US2690394A
Cited
US2576047A
Cited
US2573881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |