Patent US6036710A successfully refreshed from Google Patents.
US2636664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High vacuum pumping method, apparatus, and techniques
Assignee: Individual
•
Filing: 1949-01-28
•
Granted: 1953-04-28
•
Expires: 1969-01-28
Abstract
No abstract record available.
Inventors
- 👤 Hertzler Elmer Afton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:36
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/14; H01J41/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1950008A
Cited
US2022465A
Cited
US2160863A
Cited
US2282401A
Cited
US2246327A
Cited
US2404997A
Cited
US2469006A
Cited
US2460175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |