US2722371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pumping apparatus
Assignee: Edwards High Vacuum Ltd
•
Filing: 1952-09-08
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Granted: 1955-11-01
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Expires: 1972-09-08
Abstract
No abstract record available.
Inventors
- 👤 Arthur S D Barrett
- 👤 Power Basil Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:10
CPC Classifications
F; F04; F04F; F04F9/00; F04F9/04
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) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |