Patent US2513723A successfully refreshed from Google Patents.
US2513723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens system and mounting for television projection
Assignee: Imperial Chemical Industries Ltd
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Filing: 1948-06-22
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Granted: 1950-07-04
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Expires: 1968-06-22
Abstract
No abstract record available.
Inventors
- 👤 Greenwood William Anthony
- 👤 Liddell William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:15
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; B; B29; B29D; B29D11/00; B29D11/00596
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US56178A
Cited
US2314838A
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GB490381A
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US2212123A
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US2273801A
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US2295779A
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US2423491A
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US2424513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |