US3033450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check digit computing apparatus
Assignee: Pure Oil Co
•
Filing: 1959-12-18
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Granted: 1962-05-08
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Expires: 1979-12-18
Abstract
No abstract record available.
Inventors
- 👤 Leonard C Zitnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:16
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/10; G06F11/1008; G06F11/1012; G06F11/104; G06K; G06K5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2646923A
Cited
US2722378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |