US2809031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon paper correlating device
Assignee: Individual
•
Filing: 1954-05-13
•
Granted: 1957-10-08
•
Expires: 1974-05-13
Abstract
No abstract record available.
Inventors
- 👤 Hugh C Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:12
CPC Classifications
B; B41; B41J; B41J17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US847688A
Cited
US971315A
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US1986800A
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US2089861A
Cited
US2125167A
Cited
US2273252A
Cited
US2646279A
Cited
US2626149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |