Patent USRE32210E successfully refreshed from Google Patents.
Patent US2068299A successfully refreshed from Google Patents.
Patent US2276229A successfully refreshed from Google Patents.
Patent US2387274A successfully refreshed from Google Patents.
Patent US2681950A successfully refreshed from Google Patents.
Patent US2404474A successfully refreshed from Google Patents.
US2404474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring carbonaceous deposits
Assignee: Universal Oil Products Co
•
Filing: 1944-11-29
•
Granted: 1946-07-23
•
Expires: 1964-11-29
Abstract
No abstract record available.
Inventors
- 👤 Robert B Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:19
CPC Classifications
G; G01; G01N; G01N25/00; Y; Y10; Y10S; Y10S159/00; Y10S159/26
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) | 1949-07-22 | 1950-01-21 | 1950-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-07-22 | 1954-01-21 | 1954-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-07-22 | 1958-01-21 | 1958-07-23 | $7700.00 | Window Closed / Lapsed |