US4315747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homolinear composite equal-area world projections
Assignee: Individual
•
Filing: 1977-06-29
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Granted: 1982-02-16
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Expires: 1997-06-29
Abstract
Abstract An equal-area homolinear composite world map having parallels of latitude parallel to the equator. The map combines an equatorial map section and polar map sections. The equatorial map section is the equatorial portion of a fusiform equal-area world map and the polar sections are the polar portions of a flat-polar equal-area world map. The fusiform and flat-polar maps are prepared according to mapping equations which are the same except that the latter are adjusted to provide flat poles.
Inventors
- 👤 F. Webster McBryde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:31
CPC Classifications
G; G09; G09B; G09B29/00; G09B29/003; G09B29/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
An equal-area homolinear composite world map having parallels of latitude parallel to the equator and comprising an equatorial map section and polar map sections, said equatorial map section being the equatorial portion of a fusiform equal-area world map, having a graticule prepared according to first mapping equations, said polar map sections being the polar map sections of a flat-polar area world map having a graticule prepared according to second mapping equations, said equatorial section and said polar sections being joined along parallels which, using the same linear mapping scale, are of equal length, and said second mapping equations being derived solely by modifying said first mapping equations of said fusiform map so that the poles of the graticule of said flat-polar map are linear rather than pointed.
Claim 2
Dependent Claim
127 words
An equal-area homolinear composite world map having parallels of latitude parallel to the equator and comprising an equatorial map section and polar map sections, said equatorial map section being the equatorial portion of a fusiform equal-area world map, having a graticule prepared according to first mapping equations, said polar map sections being the polar map sections of a flat-polar area world map having a graticule prepared according to second mapping equations, said equatorial section and said polar sections being joined along parallels which, using the same linear mapping scale, are of equal length, and said second mapping equations being derived solely by modifying said first mapping equations of said fusiform map so that the poles of the graticule of said flat-polar map are linear rather than pointed.
Claim 3
Independent Claim
130 words
A method of making an equal-area homolinear composite world map having parallels of latitude parallel to the equator and comprising an equatorial map section and polar map sections, said equatorial map section being the equatorial portion of a fusiform equal-area world map having a graticule prepared according to first mapping equations, said polar map sections being the polar map sections of a flat-polar equal-area world map having a graticule prepared according to second mapping equations, said second mapping equations being derived solely by modifying said first mapping equations of said fusiform map so that the poles of the graticule of said flat-polar map are linear rather than pointed, said method comprising joining said equatorial and polar sections along parallels which, using the same linear mapping scale, are of equal length.
Claim 4
Independent Claim
130 words
A method of making an equal-area homolinear composite world map having parallels of latitude parallel to the equator and comprising an equatorial map section and polar map sections, said equatorial map section being the equatorial portion of a fusiform equal-area world map having a graticule prepared according to first mapping equations, said polar map sections being the polar map sections of a flat-polar equal-area world map having a graticule prepared according to second mapping equations, said second mapping equations being derived solely by modifying said first mapping equations of said fusiform map so that the poles of the graticule of said flat-polar map are linear rather than pointed, said method comprising joining said equatorial and polar sections along parallels which, using the same linear mapping scale, are of equal length.
References Cited (Backward Citations)
US1050596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |