Patent US3439787A successfully refreshed from Google Patents.
US3439787A
Expired / Lapsed
US
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Double magnetic-fluid clutch system for servocontrol mechanism
Assignee: Conductron Corp
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Filing: 1967-05-05
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Granted: 1969-04-22
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Expires: 1987-05-05
Abstract
No abstract record available.
Inventors
- 👤 Albert A Minciotti
- 👤 Richard Grau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:41
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/10; H02K7/108; H02K7/1085; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19386; Y10T74/19409
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) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |