US3897635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instruments facilitating the plotting of a course
Assignee: Malex AB
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Filing: 1974-06-07
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Granted: 1975-08-05
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Expires: 1994-06-07
Abstract
Abstract The invention relates to an instrument facilitating the plotting of a course on a chart, map and the like, said instrument comprising a graduated lens and a pointer movable relative to said lens. The novel matter of the invention resides in that the lens is formed as a convex lens and provided with a peripheral support ring defining underneath said lens a space for the pointer. The support ring is at least partly made from a material which prevents sliding movement of the instrument on the chart or map.
Inventors
- 👤 Karl Gunnar Magnus Peren
- 👤 Stig Ake Gosta Svensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:00
CPC Classifications
G; G01; G01B; G01B3/00; G01B3/56; G01C; G01C21/00; G01C21/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
An instrument facilitating the plotting of a course from a given point on a chart, a map or the like, comprising a pointer assembly temporarily fixable at and rotatable about said given point into a direction coinciding with the desired course, said pointed assembly comprising a pointer mounted below a transparent graduated lens, characterized in that the pointer is attached to a pin rotatably mounted in a central bore in the lens which is formed as a convex lens, and that the lens is supported by a peripheral ring defining underneath said lens a space for the pointer and consisting at least partly of rubber or like material preventing sliding movement of the instrument on the chart or map, said peripheral support ring having a downwardly tapering cross-section to form a narrow lower edge for engaging the chart or map.
Claim 2
Dependent Claim
140 words
An instrument facilitating the plotting of a course from a given point on a chart, a map or the like, comprising a pointer assembly temporarily fixable at and rotatable about said given point into a direction coinciding with the desired course, said pointed assembly comprising a pointer mounted below a transparent graduated lens, characterized in that the pointer is attached to a pin rotatably mounted in a central bore in the lens which is formed as a convex lens, and that the lens is supported by a peripheral ring defining underneath said lens a space for the pointer and consisting at least partly of rubber or like material preventing sliding movement of the instrument on the chart or map, said peripheral support ring having a downwardly tapering cross-section to form a narrow lower edge for engaging the chart or map.
Claim 3
Dependent Claim
40 words
An instrument as claimed in claim 1, characterized in that the pin is provided at its lower end with a needle that can be depressed into the chart or map and is axially displaceable within the bore of the lens.
Claim 4
Dependent Claim
23 words
An instrument as claimed in claim 1, characterized in that the pointer is an arm attached to the pin and radially projecting therefrom.
Claim 5
Dependent Claim
25 words
An instrument as claimed in claim 1, characterized in that the pointer is a transparent tongue attached to the pin and carrying a course line.
Claim 6
Dependent Claim
31 words
An instrument as claimed in claim 1, characterized in that the pointer is a circular disc attached to the pin and rotatable therewith, a course line being provided on said disc.
Claim 7
Dependent Claim
23 words
An instrument as claimed in claim 1, characterized in that the pointer is provided with a course line and with a distance graduation.
Claim 8
Dependent Claim
20 words
An instruMent as claimed in claim 1, characterized in that the lens is provided with concentric markings indicating given distance.
Claim 9
Dependent Claim
31 words
An instrument as claimed in claim 1, characterized in that the lens is provided with lines for orienting it relative to said chart, and also with a peripherally disposed graduated scale.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |