US3441835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step-by-step nonlinear voltage divider for digital photometer
Assignee: Czech Academy of Sciences
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Filing: 1965-01-21
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Granted: 1969-04-29
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Expires: 1985-01-21
Abstract
No abstract record available.
Inventors
- 👤 Jan Hekrdle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:02
CPC Classifications
H; H03; H03M; H03M1/00; G; G01; G01J; G01J1/00; G01J1/10; G01J1/16; G01J1/1626; G01T; G01T1/00; G01T1/02; G01T1/08; H03H; H03H7/00; H03H7/24; H03M1/06; H03M1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2237950A
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US2839740A
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US3080790A
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US3064182A
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US3220304A
Cited
US3016787A
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US3340764A
Cited
US3403324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |