Patent US2590274A successfully refreshed from Google Patents.
Patent US4506450A successfully refreshed from Google Patents.
US4506450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminated level
Assignee: Individual
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Filing: 1984-03-27
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Granted: 1985-03-26
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Expires: 2004-03-27
Abstract
Abstract A precision level embodying solid state electronics is disclosed. A level body portion contains chambers for paired light emitting diodes operable to indicate angular deviations from true horizontal and true vertical over desired ranges. A mercury droplet in each compartment is in contact with an arcuate conducting strip leading to a battery terminal of one polarity. Upon angular displacement of the level, the mercury droplet sequentially contacts light emitting diode leads of like polarity. The light emitting diode leads of opposite polarity are connected through a common conductor element and an on-off switch of the level to a battery terminal of like polarity. The same switch is operably connected with the groups of light emitting diodes used to indicate angular deviations from the true horizontal and true vertical. The light emitting diodes may be embedded in a clear transparent medium or in variously colored translucent elements.
Inventors
- 👤 John E. Fleming
- 👤 Robert D. Dameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:39
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/02; G01C9/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
270 words
An illuminated level for use in horizontal and vertical modes selectively comprising a body portion, the body portion having first and second chamber means and a battery compartment, the body portion also having first and second display windows, a horizontal mode angle deviation indicator assembly mounted within the first chamber means, a vertical mode angle deviation indicator assembly mounted within the second chamber means, each assembly including an arcuate conductor channel containing a single droplet of a conducting liquid movable therein and a plurality of angularly spaced light emitting elements having terminals of like polarity projecting into said channel in the path of movement of said droplet, said light emitting elements having terminals of opposite polarity, a common conductor electrically connected with the last-named terminals, a conductor electrically connected between said channel and storage battery means within the battery compartment, a three position switch on the body portion having an intermediate power off terminal and horizontal and vertical mode operating terminals, a conductor interconnecting the three position switch with said storage battery means, said common conductor of each assembly being electrically connected with said switch horizontal and vertical mode operating terminals, whereby whenever one assembly is electrically energized the other assembly is non-energized to conserve battery power, the first chamber means comprising a single chamber containing the horizontal mode angle deviation indicator assembly, the second chamber means comprising a pair of separated chambers each containing a part of the vertical mode angle deviation indicator assembly, and said parts of the last-named assembly being electrically connected through said common conductor which is electrically connected to said switch vertical mode operating terminal.
Claim 2
Dependent Claim
270 words
An illuminated level for use in horizontal and vertical modes selectively comprising a body portion, the body portion having first and second chamber means and a battery compartment, the body portion also having first and second display windows, a horizontal mode angle deviation indicator assembly mounted within the first chamber means, a vertical mode angle deviation indicator assembly mounted within the second chamber means, each assembly including an arcuate conductor channel containing a single droplet of a conducting liquid movable therein and a plurality of angularly spaced light emitting elements having terminals of like polarity projecting into said channel in the path of movement of said droplet, said light emitting elements having terminals of opposite polarity, a common conductor electrically connected with the last-named terminals, a conductor electrically connected between said channel and storage battery means within the battery compartment, a three position switch on the body portion having an intermediate power off terminal and horizontal and vertical mode operating terminals, a conductor interconnecting the three position switch with said storage battery means, said common conductor of each assembly being electrically connected with said switch horizontal and vertical mode operating terminals, whereby whenever one assembly is electrically energized the other assembly is non-energized to conserve battery power, the first chamber means comprising a single chamber containing the horizontal mode angle deviation indicator assembly, the second chamber means comprising a pair of separated chambers each containing a part of the vertical mode angle deviation indicator assembly, and said parts of the last-named assembly being electrically connected through said common conductor which is electrically connected to said switch vertical mode operating terminal.
Claim 3
Dependent Claim
60 words
An illuminated level as defined in claim 1, and said light emitting elements being arranged in pairs of a like color whereby one or both of said leads of a first polarity of each pair of light emitting elements can make electrical contact with said droplet to indicate an approximate angular deviation or a precise angular deviation of the level.
Claim 4
Dependent Claim
173 words
An illuminated level for use in horizontal and vertical modes selectively comprising a body portion, the body portion having first and second chamber means and a battery compartment, said first chamber means comprising a single chamber containing a horizontal mode angle deviation indicator assembly, the second chamber means comprising a pair of separated chambers each containing a part of a vertical mode angle deviation indicator assembly, said parts of the vertical mode angle deviation indicator assembly being electrically connected, said horizontal mode angle deviation indicator assembly and said parts of the vertical mode angle deviation assembly each including an arcuate conductor channel containing a droplet of a conducting liquid movable therein and a plurality of angularly spaced light emitting elements having terminals of like polarity projecting into said channel in the path of movement of said droplet, said light emitting elements having terminals of opposite polarity, and circuit means including a manual switch on the body portion and further including conductors connected between said arcuate conductor channels and batteries within said battery compartment.
Claim 5
Dependent Claim
173 words
An illuminated level for use in horizontal and vertical modes selectively comprising a body portion, the body portion having first and second chamber means and a battery compartment, said first chamber means comprising a single chamber containing a horizontal mode angle deviation indicator assembly, the second chamber means comprising a pair of separated chambers each containing a part of a vertical mode angle deviation indicator assembly, said parts of the vertical mode angle deviation indicator assembly being electrically connected, said horizontal mode angle deviation indicator assembly and said parts of the vertical mode angle deviation assembly each including an arcuate conductor channel containing a droplet of a conducting liquid movable therein and a plurality of angularly spaced light emitting elements having terminals of like polarity projecting into said channel in the path of movement of said droplet, said light emitting elements having terminals of opposite polarity, and circuit means including a manual switch on the body portion and further including conductors connected between said arcuate conductor channels and batteries within said battery compartment.
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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |