Patent US2689294A successfully refreshed from Google Patents.
US2689294A
Expired / Lapsed
US
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Metal film attenuator
Assignee: New York University
•
Filing: 1948-01-16
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Granted: 1954-09-14
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Expires: 1968-01-16
Abstract
No abstract record available.
Inventors
- 👤 Weber Ernst
- 👤 Vernon Mount
- 👤 John W E Griemsmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:01
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/22; H01P1/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1296938A
Cited
US1957538A
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US1905353A
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GB486639A
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US2262134A
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FR887597A
Cited
US2399645A
Cited
US2429401A
Cited
US2437067A
Cited
US2440691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |