US3370469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler liquid level indicator
Assignee: Thales Optronics Ltd
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Filing: 1966-09-13
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Granted: 1968-02-27
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Expires: 1986-09-13
Abstract
No abstract record available.
Inventors
- 👤 Ian H Mackenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:23
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/284; G01F23/292; G01F23/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
APPARATUS FOR PROVIDING AN INDICATION OF THE LEVEL OF WATER IN A BOILER COMPRISING IN COMBINATION A WATER GAUGE TUBE HAVING A COLUMN OF LIGHT ENTRANCE WINDOWS, AND AN OPPOSED COLUMN OF LIGHT EXIT OR VIEWING WINDOWS FACING A VIEWING POINT, AND LIGHT PROJECTING MEANS ADAPTED TO PROJECT A BEAM OF LIGHT ON TO THE ENTRANCE WINDOWS, THE SAID WINDOWS AND LIGHT PROJECTING MEANS BEING ADAPTED AND ARRANGED SO THAT UPPER AND LOWER PORTIONS OF THE BEAM WHEN PASSING RESPECTIVELY THROUGH STEAM AND WATER IN THE TUBE EMERGE MUTUALLY DIVERGENT THROUGH UPPER AND LOWER GROUPS OF THE VIEWING WINDOWS, AND OPTICAL LIGHT TRANSMITTING OR REFLECTING MEANS IN THE PATH OF AT LEAST ONE OF THE EMERGENT PORTIONS OF THE BEAM ADAPTED TO BRING THE TWO EMERGENT PORTIONS OF THE BEAM INTO CONVERGENCE AT THE VIEWING POINT SO THAT, WHEN VIEWED FROM THE VIEWING POINT, BOTH SAID GROUPS ARE VISIBLE AND APPEAR MUTUALLY DISPLACED.
Claim 2
Dependent Claim
153 words
APPARATUS FOR PROVIDING AN INDICATION OF THE LEVEL OF WATER IN A BOILER COMPRISING IN COMBINATION A WATER GAUGE TUBE HAVING A COLUMN OF LIGHT ENTRANCE WINDOWS, AND AN OPPOSED COLUMN OF LIGHT EXIT OR VIEWING WINDOWS FACING A VIEWING POINT, AND LIGHT PROJECTING MEANS ADAPTED TO PROJECT A BEAM OF LIGHT ON TO THE ENTRANCE WINDOWS, THE SAID WINDOWS AND LIGHT PROJECTING MEANS BEING ADAPTED AND ARRANGED SO THAT UPPER AND LOWER PORTIONS OF THE BEAM WHEN PASSING RESPECTIVELY THROUGH STEAM AND WATER IN THE TUBE EMERGE MUTUALLY DIVERGENT THROUGH UPPER AND LOWER GROUPS OF THE VIEWING WINDOWS, AND OPTICAL LIGHT TRANSMITTING OR REFLECTING MEANS IN THE PATH OF AT LEAST ONE OF THE EMERGENT PORTIONS OF THE BEAM ADAPTED TO BRING THE TWO EMERGENT PORTIONS OF THE BEAM INTO CONVERGENCE AT THE VIEWING POINT SO THAT, WHEN VIEWED FROM THE VIEWING POINT, BOTH SAID GROUPS ARE VISIBLE AND APPEAR MUTUALLY DISPLACED.
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) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |