US3553666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote sensing indicator device
Assignee: Illinois Tool Works Inc
•
Filing: 1969-04-15
•
Granted: 1971-01-05
•
Expires: 1989-04-15
Abstract
Abstract A REMOTE SENSING LIQUID LEVEL INDICATOR SYSTEM IN WHICH AN INDICATOR MEMBER HAVING PLURALITY OF CONNECTED INDICATOR ARMS IS INSERTED IN A RESERVOIR AND LIGHT FROM A SELECTIVELY ENERGIZABLE LIGHT SOURCE IS DIRECTED THROUGH REFLECTIVE SURFACE MEANS IN THE MEMBER TO A PRISMATIC SURFACE MEANS LOCATED AT EHE EXTREMITY OF THE MEMBER AND FROM THE EXTREMITY OF THIS MEMBE LIGHT IS THEREAFTER REFLECTED INTO A LIGHT RECEIVING AND TRANSMITTING MEANS THEREBY ENABLING A VIEWER TO ASCERTAIN THE LEVEL OF LIQUID IN THE RESERVOIR FROM A REMOTE POSITION.
Inventors
- 👤 Robert R Melone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:41
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/284; G01F23/292; G01F23/2921; G01F23/2922; G01F23/2925; G01F23/2927; Y; Y10; Y10S; Y10S116/00; Y10S116/05
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |