US3387767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High vacuum pump with cryosorption pumping element
Assignee: National Research Corp
•
Filing: 1966-12-07
•
Granted: 1968-06-11
•
Expires: 1986-12-07
Abstract
No abstract record available.
Inventors
- 👤 Hecht Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:04
CPC Classifications
B; B01; B01D; B01D8/00; H; H01; H01G; H01G13/00; H01G13/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3147910A
Cited
US3241740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |