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s. This identification may consist of the
attorney's name and docket number or the inventor's name and
case number and may include the sheet number and the total
number of sheets filed (for example, "sheet 2 of 4"). The
following rule, reproduced from title 37 of the Code of Federal
Regulations, relates to the standards for drawings:
1.84 Standards for drawings.
(a) Paper and ink. Drawings must be made upon paper which is
flexible, strong, white, smooth, non-shiny and durable.
India ink, or its equivalent in quality, is preferred for
pen drawings to secure perfectly black solid lines. The
use of white pigment to cover lines is not normally
acceptable.
(b) Size of sheet and margins. The size of the sheets on which
drawings are made may either be exactly 81/2 by 14 inches
(21.6 by 35.6 cm.) or exactly 21.0 by 29.7 cm. (DIN size
A4). All drawing sheets in a particular application must
be the same size. One of the shorter sides of the sheet is
regarded as its top.
(1) On 81/2 by 14 inch drawing sheets, the drawings must
include a top margin of 2 inches (5.1 cm.) and bottom and
side margins of 1/4 inch (6.4 mm.) from the edges, thereby
leaving a "sight" precisely 8 by 113/4 inches (20.3 by
29.8 cm.). Margin border lines are not permitted. All work
must be included within the "sight". The sheets may be
provided with two 1/4 inch (6.4 mm.) diameter holes having
their centerlines spaced 11/16 inch (17.5 mm.) below the
top edge and 23/4 inches (7.0 cm.) apart, said holes being
equally spaced from the respective side edges.
(2) On 21.0 by 29.7 cm. drawing sheets, the drawing must
include a top margin of at least 2.5 cm., a left side
margin of 2.5 cm., a right side margin of 1.5 cm., and a
bottom margin of 1.0 cm. Margin border lines are not
permitted. All work must be contained within a sight size
not to exceed 17 by 26.2 cm.
(c) Character of lines. All drawings must be made with
drafting instruments or by a process which will give them
satisfactory reproduction characteristics. Every line and
letter must be durable, black, sufficiently dense and
dark, uniformly thick and well defined; the weight of all
lines and letters must be heavy enough to permit adequate
reproduction. This direction applies to all lines however
fine, to shading, and to lines representing cut surfaces
in sectional views. All lines must be clean, sharp, and
solid. Fine or crowded lines should be avoided. Solid
black should not be used for sectional or surface shading.
Freehand work should be avoided wherever it is possible to
do so.
(d) Hatching and shading. (1) Hatching should be made by
oblique parallel lines spaced sufficiently apart to enable
the lines to be distinguished without difficulty. (2)
Heavy lines on the shade side of objects should preferably
be used except where they tend to thicken the work and
obscure reference characters. The light should come from
the upper left-hand corner at an angle of 45 degrees.
Surface delineations should preferably be shown by proper
shading, which should be open.
(e) Scale. The scale to which a drawing is made ought to be
large enough to show the mechanism without crowding when
the drawing is reduced in size to two-thirds in
reproduction, and views of portions of the mechanism on a
larger scale should be used when necessary to show details
clearly; two or more sheets should be used if one does not
give sufficient room to accomplish this end, but the
number of sheets should not be more than is necessary.
(f) Reference characters. The different views should be
consecutively numbered figures. Reference numerals (and
letters, but numerals are preferred) must be plain,
legible and carefully formed, and not be encircled. They
should, if possible, measure at least one-eighth of an
inch (3.2 mm.) in height so that they may bear reduction
to one twenty-fourth of an inch (1.1 mm.); and they may be
slightly larger when there is sufficient room. They should
not be so placed in the close and complex parts of the
drawing as to interfere with a thorough comprehension of
the same, and therefore should rarely cross or mingle with
the lines. When necessarily grouped around a certain part,
they should be placed at a little distance, at the closest
point where there is available space, and connected by
lines with the parts to which they refer. They should not
be placed upon hatched or shaded surfaces but when
necessary, a blank space may be left in the hatching or
shading where the character occurs so that it shall appear
perfectly distinct and separate from the work.
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