Patent US2976124A successfully refreshed from Google Patents.
US2976124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid indicator
Assignee: ALLIN Manufacturing Co
•
Filing: 1958-06-02
•
Granted: 1961-03-21
•
Expires: 1978-06-02
Abstract
No abstract record available.
Inventors
- 👤 Wittlin Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:50
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/222
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
IN A FLUID INDICATOR HAVING A FLOW PASSAGE HAVING INTERIOR WALLS, SAID PASSAGE BEING BOUNDED AT ONE PORTION BY TRANSPARENT MEANS PERMITTING THE VIEWING OF THE INTERIOR THEREOF, MEANS IN SAID PASSAGE FOR INDICATING THE PRESENCE OF ANOTHER SUBSTANCE IN THE FLUID, COMPRISING: A SHEET OF MATERIAL HAVING AN APPEARANCE VARYING AS A FUNCTION OF THE PRESENCE OF ANOTHER SUBSTANCE IN THE FLUID, SAID SHEET COMPRISING AN ELONGATED STRIP BEING BOUND ON ONE SIDE BY A SPRING AND A SUPPORT, SAID SHEET, SPRING AND SUPPORT BEING ADAPTED TO BE BIASED AGAINST THE INTERIOR WALLS OF SAID PASSAGE.
References Cited (Backward Citations)
US1103985A
Cited
GB324326A
Cited
US2159355A
Cited
US2624308A
Cited
US2600148A
Cited
DE830250C
Cited
US2725844A
Cited
US2744488A
Cited
US2757632A
Cited
US2844026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |