US2973456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp flasher with daylight-responsive inhibiting means
Assignee: National Research Council Canada
•
Filing: 1957-05-06
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Granted: 1961-02-28
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Expires: 1977-05-06
Abstract
No abstract record available.
Inventors
- 👤 Smyth Henry Lyall Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:10
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/34; B60Q1/38; B60Q1/382; G; G08; G08B; G08B5/00; G08B5/22; G08B5/36; G08B5/38; H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2823; H05; H05B; H05B39/00; H05B39/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2292775A
Cited
US2300795A
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US2750453A
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US2786964A
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US2787712A
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US2776420A
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US2751501A
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US2770732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |