US3622323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing a relief contour effect for topographic maps
Assignee: ALFRED M FRASER
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Filing: 1969-12-03
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Granted: 1971-11-23
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Expires: 1989-12-03
Abstract
Abstract A photomechanical process of producing a relief contour effect for topographical maps by means of using a positive transparency form of the topographical map, a negative transparency form produced therefrom, a positive mask transparency prepared for a portion of the map contour lines, a negative mask transparency produced therefrom, a three-ply overlay of the negative transparency positive mask-positive transparency assembled and a positive print obtained therefrom, a three-ply overlay of the negative transparency negative mask-positive transparency assembled and a negative print obtained therefrom, and a final print prepared from both the positive and negative prints.
Inventors
- 👤 Alfred M Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:02
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/88
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
The process according to claim 1 wherein said select portion masking is prepared on a first transparency sheet by shading the portion of each contour line which depicts the hidden side of any number of elevations when viewing said elevations at a 45* angle.
Claim 2
Dependent Claim
27 words
The process according to claim 2 wherein said remaining portion masking is prepared by producing a negative of said first transparency sheet on a second transparency sheet.
Claim 3
Dependent Claim
27 words
The process according to claim 1 wherein said firstly overlaid positive transparency form is shifted along a 45* angle toward lower right of said positive transparency form.
Claim 4
Dependent Claim
28 words
The process according to claim 1 wherein said secondly overlaid positive transparency form is shifted along a 45* angle toward the upper left of said positive transparency form.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |