Patent US3872597A successfully refreshed from Google Patents.
US3872597A
Expired / Lapsed
US
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Perspective machine
Assignee: Individual
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Filing: 1973-12-10
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Granted: 1975-03-25
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Expires: 1993-12-10
Abstract
Abstract This invention relates to a perspective machine which is used by draftsmen and the like and will enable the draftsmen to provide a vanishing point which is either on the drafting table or beyond the limits of that table. The straight edge of the machine can be so adjusted that the lines drawn by the draftsman are either exactly horizontal, exactly vertical or most angle there between.
Inventors
- 👤 Wayne W Tennant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:00
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/14; B43L13/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A perspective machine comprising a straight edge, a pair of spaced arms means pivotaly securing one end of said arms to the straight edge, a clamp, having a slot therein, means pivotally securing each of said arms to the clamp, said means pivotally securing said arms to the clamp extending through the slot, and adjustable means extending through each of said arms to move said arms relative to each other.
Claim 2
Dependent Claim
70 words
A perspective machine comprising a straight edge, a pair of spaced arms means pivotaly securing one end of said arms to the straight edge, a clamp, having a slot therein, means pivotally securing each of said arms to the clamp, said means pivotally securing said arms to the clamp extending through the slot, and adjustable means extending through each of said arms to move said arms relative to each other.
Claim 3
Dependent Claim
22 words
A perspective machine as recited in claim 1 and said adjustable means including a threaded sPindle screwed into each of said arms.
Claim 4
Dependent Claim
36 words
A perspective machine as recited in claim 1 and the distance from the pivotal mounting of each of the arms to the straight edge and the pivotal mounting of the arms to the clamp being equal.
Claim 5
Dependent Claim
50 words
A perspective machine as recited in claim 1 and said adjustable means including a threaded spindle screwed into each of said arms and the distance from the pivotal mounting of each of the arms to the straight edge and the pivotal mounting of the arms to the clamp, being equal.
References Cited (Backward Citations)
US3191307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |