US2442975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focusing system
Assignee: RCA Corp
•
Filing: 1943-08-31
•
Granted: 1948-06-08
•
Expires: 1963-08-31
Abstract
No abstract record available.
Inventors
- 👤 Gustave L Grundmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:12
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J29/64; H01J29/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1981322A
Cited
US2188579A
Cited
US2224933A
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US2102421A
Cited
GB472165A
Cited
US2165803A
Cited
US2219193A
Cited
US2200039A
Cited
US2336837A
Cited
US2259531A
Cited
GB523439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-08 | 1951-12-08 | 1952-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-08 | 1955-12-08 | 1956-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-08 | 1959-12-08 | 1960-06-08 | $7700.00 | Window Closed / Lapsed |