US3521269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tracking analog to digital converter
Assignee: International Business Machines Corp
•
Filing: 1965-12-20
•
Granted: 1970-07-21
•
Expires: 1985-12-20
Abstract
No abstract record available.
Inventors
- 👤 Everett G Brooks
- 👤 John S Gentelia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:51
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2784396A
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US2965891A
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US3108266A
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US3112478A
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US3127601A
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US3189891A
Cited
US3264378A
Cited
US3201781A
Cited
US3261012A
Cited
US3274586A
Cited
US3349390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |