Patent US4476531B1 successfully refreshed from Google Patents.
US4476531B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine analyzer with digital waveform display
Assignee: SPX Technologies Inc
•
Filing: 1981-12-04
•
Granted: 1999-01-09
•
Expires: 2001-12-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Marino
- 👤 Michael J Kling
- 👤 Sydney J Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:53
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/02; F02P17/04; F02P17/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-08 | 2002-07-10 | 2003-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-08 | 2006-07-10 | 2007-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-08 | 2010-07-10 | 2011-01-09 | $7700.00 | Window Closed / Lapsed |