US2522969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic vacuum system
Assignee: RCA Corp
•
Filing: 1947-11-28
•
Granted: 1950-09-19
•
Expires: 1967-11-28
Abstract
No abstract record available.
Inventors
- 👤 Perry C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:11
CPC Classifications
F; F04; F04F; F04F9/00; F04F9/08; H; H01; H01J; H01J7/00; H01J7/42; H01J9/00; H01J9/38; H01J9/385
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB411911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |