US2520993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-level indicator
Assignee: Inventors Guild
•
Filing: 1946-04-06
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Granted: 1950-09-05
•
Expires: 1966-04-06
Abstract
No abstract record available.
Inventors
- 👤 Carl W Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:06
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/222
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A WATER LEVEL INDICATING COMPOSITION COMPRISING A WATER SOLUBLE COBALT THIOCYANATE, AND A FINELY DISPERSED FILLER MATERIAL HAVING A COLOR OTHER THAN THAT OF SAID THIOCYANATE, THE AMOUNT OF THE THIOCYANATE BEING SUFFICIENT TO COLOR THE FILLER MATERIAL.
Claim 2
Dependent Claim
38 words
A WATER LEVEL INDICATING COMPOSITION COMPRISING A WATER SOLUBLE COBALT THIOCYANATE, AND A FINELY DISPERSED FILLER MATERIAL HAVING A COLOR OTHER THAN THAT OF SAID THIOCYANATE, THE AMOUNT OF THE THIOCYANATE BEING SUFFICIENT TO COLOR THE FILLER MATERIAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |