US2811039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depth indicating apparatus for large tanks
Assignee: VAPOR RECOVERY SYSTEMS CO
•
Filing: 1954-06-07
•
Granted: 1957-10-29
•
Expires: 1974-06-07
Abstract
No abstract record available.
Inventors
- 👤 Wilbur G Hein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:31
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/30; G01F23/40; G01F23/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US776315A
Cited
US1689941A
Cited
US1723173A
Cited
US1866902A
Cited
US2110490A
Cited
US2348362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |