US1485772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-level gauge
Assignee: DELAWARE CHEMICAL ENGINEERING
•
Filing: 1923-07-21
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Granted: 1924-03-04
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Expires: 1943-07-21
Abstract
No abstract record available.
Inventors
- 👤 Pont Francis I Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:20
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/0007
Claims Analysis
Total Claims: 0
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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) | 1927-03-04 | 1927-09-03 | 1928-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-03-04 | 1931-09-03 | 1932-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-03-04 | 1935-09-03 | 1936-03-04 | $7700.00 | Window Closed / Lapsed |