Patent US2837720A successfully refreshed from Google Patents.
US2837720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attenuation device and material therefor
Assignee: Individual
•
Filing: 1953-08-31
•
Granted: 1958-06-03
•
Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 Alvin R Saltzman
- 👤 Jack M Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:36
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/24; H01P1/26; H01P1/264
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2567379A
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US2610250A
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US2490826A
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US2649396A
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US2589157A
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US2609318A
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US2644781A
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US2730597A
Cited
US2752495A
Cited
US2695240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |