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US2758484A
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Magnetic density servo unit
Assignee: Individual
•
Filing: 1954-03-16
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Granted: 1956-08-14
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Expires: 1974-03-16
Abstract
No abstract record available.
Inventors
- 👤 James P Keltner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:02
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/149; Y; Y10; Y10S; Y10S74/00; Y10S74/04; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18088; Y10T74/19; Y10T74/19019; Y10T74/19219; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19437; Y10T74/19484; Y10T74/19493; Y10T74/19628
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1614819A
Cited
US1909918A
Cited
US2452575A
Cited
US2590029A
Cited
US2545296A
Cited
US2718602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |