US2863287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum control system
Assignee: Research Corp
•
Filing: 1956-11-09
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Granted: 1958-12-09
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Expires: 1976-11-09
Abstract
No abstract record available.
Inventors
- 👤 John W Berkman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:25
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/71; A61M1/74; A61M1/742; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; G05D16/202; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7761
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |