Patent US3454879A successfully refreshed from Google Patents.
US3454879A
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US
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Direct current summing circuit with compensating means
Assignee: International Standard Electric Corp
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Filing: 1966-03-17
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Granted: 1969-07-08
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Expires: 1986-03-17
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang Smitka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:58
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/387; G; G06; G06G; G06G7/00; G06G7/12; G06G7/14; G08; G08C; G08C13/00; G08C13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2994840A
Cited
US3089999A
Cited
US3202916A
Cited
US3136948A
Cited
DE1145964B
Cited
US3183498A
Cited
US3275949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |