US3518028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power reduction of liquid ring pumps
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1968-01-26
•
Granted: 1970-06-30
•
Expires: 1988-01-26
Abstract
No abstract record available.
Inventors
- 👤 Richard C Minick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:35
CPC Classifications
F; F04; F04C; F04C28/00; F04C28/18; F04C28/22; F04C19/00; F04D; F04D9/00; F04D9/04; F04D9/041; F04D9/042; F04D9/044; F04D9/048
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2598484A
Cited
US2612844A
Cited
US2662481A
Cited
US2881708A
Cited
GB735099A
Cited
DE1021720B
Cited
GB807607A
Cited
US3050008A
Cited
US3082694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |