US3576523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Position-indicating flasher for boat docks
Assignee: Individual
•
Filing: 1969-08-04
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Granted: 1971-04-27
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Expires: 1989-08-04
Abstract
Abstract A boat dock position-indicating flasher composed of two lights of different colors which flash alternately. One light has a wide cone of illumination so as to be visible from a wide range of angles. The other light is visible only when the observer is located in direct alignment with the flasher. Because the two lights flash alternately, they can easily be distinguished from one another even at a great distance.
Inventors
- 👤 Edmund Clarence Lerbakken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:07
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/09; G; G08; G08G; G08G3/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A position marking apparatus for indicating the location of a boat dock or other object to be found on a body of water, said apparatus comprising lamp means for providing a pair of lights, one of the lights being a beam of a relatively narrow defined angle and the other of the lights being unbeamed and visible within a relatively wide angle compared with said one beam on the order of at least about 180* and is of a different color and a flip-flop circuit means for operating the lights sequentially so that one light is off while the other is on to thereby facilitate observation and discrimination of the two lights although the lights emanate from points close together and the axis of said one light being located in approximately the center of the area in which the unbeaMed light is visible.
Claim 2
Dependent Claim
143 words
A position marking apparatus for indicating the location of a boat dock or other object to be found on a body of water, said apparatus comprising lamp means for providing a pair of lights, one of the lights being a beam of a relatively narrow defined angle and the other of the lights being unbeamed and visible within a relatively wide angle compared with said one beam on the order of at least about 180* and is of a different color and a flip-flop circuit means for operating the lights sequentially so that one light is off while the other is on to thereby facilitate observation and discrimination of the two lights although the lights emanate from points close together and the axis of said one light being located in approximately the center of the area in which the unbeaMed light is visible.
Claim 3
Dependent Claim
60 words
The apparatus of claim 1 wherein two lamps are provided, one lamp to provide one of the beams and other lamp to provide the other of the beams, one of the lamps has connected to it a shielding tube to direct the light therefrom along a narrow axis having a predetermined relationship in respect to the axis of the apparatus.
Claim 4
Dependent Claim
73 words
The apparatus according to claim 1 including a housing having a pair of lamps mounted thereon, one such lamp having a shielding tube connected thereto for confining the light admitted from said lamp to relatively narrow angle, the other of said lamps having a lens optically associated therewith, said lens having a large number of surface irregularities to thereby render the light from the second lamp visible from a wide range of angles.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |