US3479026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic document sensor
Assignee: International Business Machines Corp
•
Filing: 1968-03-26
•
Granted: 1969-11-18
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Expires: 1988-03-26
Abstract
No abstract record available.
Inventors
- 👤 William B Plummer
- 👤 Taco H Van Den Honert
- 👤 Melvin G Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:12
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/965; G; G06; G06K; G06K13/00; G06K13/02; G06K13/06; G06K13/067
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3190644A
Cited
US3342480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |