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US2651684A
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Automatic signal attenuator
Assignee: International Standard Electric Corp
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Filing: 1949-04-06
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Granted: 1953-09-08
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Expires: 1969-04-06
Abstract
No abstract record available.
Inventors
- 👤 Hargreaves Thomas Fred Stanley
- 👤 Gould William Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:49
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/45; H04Q1/453; H04Q1/4535
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1691076A
Cited
US1976096A
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US2031942A
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US2106785A
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US2372419A
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US2382097A
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US2463073A
Cited
US2430457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |