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US2893633A
Expired / Lapsed
US
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Bi-directional electric counting system
Assignee: Individual
•
Filing: 1957-10-10
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Granted: 1959-07-07
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Expires: 1977-10-10
Abstract
No abstract record available.
Inventors
- 👤 Richard H Van Haagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
G; G06; G06M; G06M1/00; G06M1/08; G06M1/10; G06M1/108; G06M3/00; G06M3/14; G06M7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-06 | 1963-01-05 | 1963-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-06 | 1967-01-05 | 1967-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-06 | 1971-01-05 | 1971-07-07 | $7700.00 | Window Closed / Lapsed |