US2935243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pumping apparatus
Assignee: N G N ELECTRICAL Ltd
•
Filing: 1956-12-10
•
Granted: 1960-05-03
•
Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Sadler Peter
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; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86919
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2063665A
Cited
US2289845A
Cited
CA487648A
Cited
GB690649A
Cited
US2826353A
Cited
US2707249A
Cited
US2722371A
Cited
GB719990A
Cited
US2806644A
Cited
US2721694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |