US4008528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawing apparatus
Assignee: Individual
•
Filing: 1976-03-22
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Granted: 1977-02-22
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Expires: 1996-03-22
Abstract
Abstract A drawing apparatus to assist in providing an artist with a true perspective of the scene viewed on a transparent surface viewed through a fixed eyepiece, the transparent surface being the concave side of a spherical segment encompassing about 60° of arc which approximates the normal cone of vision.
Inventors
- 👤 Richard A. Caulfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:29
CPC Classifications
G; G09; G09B; G09B11/00; G09B11/10; B; B43; B43L; B43L13/00; B43L13/14; B43L13/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
A drawing apparatus comprising an eyepiece, a marking surface through which the scene to be drawn may be viewed, said marking surface being arcuate and substantially equally distant at all areas from said eyepiece, mounting means for holding said eyepiece and marking surface in fixed relation for aiming at the scene to be produced on said marking surface.
Claim 2
Dependent Claim
58 words
A drawing apparatus comprising an eyepiece, a marking surface through which the scene to be drawn may be viewed, said marking surface being arcuate and substantially equally distant at all areas from said eyepiece, mounting means for holding said eyepiece and marking surface in fixed relation for aiming at the scene to be produced on said marking surface.
Claim 3
Dependent Claim
29 words
A drawing apparatus as in claim 1 wherein said mounting means comprises a platform and spaced upright supports, one for said eyepiece and others for supporting said marking surface.
Claim 4
Dependent Claim
16 words
A drawing apparatus as in claim 2 wherein one of said upright supports is laterally adjustable.
Claim 5
Dependent Claim
29 words
A drawing apparatus as in claim 1 wherein the marking surface is translucent pre-molded tracing cloth primed with a clear plastic-type medium to be suitable as a painting surface.
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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |