US2448560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming screens for the reception of projected images
Assignee: Individual
•
Filing: 1944-10-05
•
Granted: 1948-09-07
•
Expires: 1964-10-05
Abstract
No abstract record available.
Inventors
- 👤 Robert O Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:49
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US998579A
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US1166569A
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US1804170A
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US1878075A
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GB347282A
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US1890819A
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US1966747A
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US2242567A
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US2245896A
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US2216901A
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US2278073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |