US3448916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unloading system for compressors
Assignee: Ingersoll Rand Co
•
Filing: 1967-06-16
•
Granted: 1969-06-10
•
Expires: 1987-06-16
Abstract
No abstract record available.
Inventors
- 👤 Grover D Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:19
CPC Classifications
F; F04; F04C; F04C28/00; F04C28/24; F04C29/00; F04C29/0007; F04C29/0014
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1968985A
Cited
US2661145A
Cited
US2920812A
Cited
US3191854A
Cited
US3255954A
Cited
US3168236A
Cited
US3349994A
Cited
US3367562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |