Patent US2877946A successfully refreshed from Google Patents.
US2877946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump
Assignee: Central Scientific Co
•
Filing: 1955-11-10
•
Granted: 1959-03-17
•
Expires: 1975-11-10
Abstract
No abstract record available.
Inventors
- 👤 Victor C Garrison
- 👤 Edward M Nakaji
- 👤 Kenneth F Wessling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:08
CPC Classifications
F; F04; F04C; F04C23/00; F04C23/001; F04C27/00; F04C27/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US253551A
Cited
US1372576A
Cited
US2062045A
Cited
US1949505A
Cited
US1928300A
Cited
US2126247A
Cited
US2305317A
Cited
US2275774A
Cited
US2306608A
Cited
US2306632A
Cited
US2455297A
Cited
US2487826A
Cited
US2633292A
Cited
US2634904A
Cited
US2759664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |