Patent US3413491A successfully refreshed from Google Patents.
US3413491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peak holder employing field-effect transistor
Assignee: Beckman Coulter Inc
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Filing: 1964-09-21
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Granted: 1968-11-26
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Expires: 1984-09-21
Abstract
No abstract record available.
Inventors
- 👤 George I Reeves
- 👤 David M Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:21
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/04; H; H03; H03K; H03K5/00; H03K5/153; H03K5/1532
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2925557A
Cited
US3222610A
Cited
US3257631A
Cited
US3264493A
Cited
US3259760A
Cited
US3217565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |