US3523229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital-analog servo system
Assignee: International Business Machines Corp
•
Filing: 1967-01-05
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Granted: 1970-08-04
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Expires: 1987-01-05
Abstract
No abstract record available.
Inventors
- 👤 Robert James Black
- 👤 Frank John Sordello
- 👤 Jack Stewart Swartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/20; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/27; G05B19/29; G05B19/291; G05B19/293; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41021; G05B2219/41086; G05B2219/41459; G05B2219/42; G05B2219/42202; H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/26
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) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |