Line Styles and Conventions in Patent Drawing

A patent drawing made for an invention can increase the chances of your application being granted manifold. However, a patent drawing is a very structured document wherein you will have to put every element as per the specified norms. Even while adding a line you need to follow the guidelines meant for line styles in a patent drawing. Some of the important line types those we can use in drawings for patents are Solid Line, Phantom Line, Projected Line, Hidden Line, Projected Line, and Boundary Line.

With this article, we have come up with some important facts pertaining to line styles and conventions in patent drawings.

Drawing in Invention

Thick Continuous: These are visible lines used on each view including arcs/circles/curves/title block and border.

Thick dashes: Like “Thick Continuous” lines these HIDDEN LINES too are used on each view. Dashes start and end with contact to a visible or hidden line.

Thin continuous: “THIN CONTINOUS LINES” are used for dimensioning lines, projection lines, leaders, letterform used in the title block.

Thin chain: Thin chain lines are CENTRE LINES used in the axis of solid forms; pitch lines (think roof line) etc.

Points to consider while using these lines:

  • All lines on any particular patent drawing should be either in pencil or ink, but not a mixture of both.
  • In case you are creating a patent drawing using a computer use the following line thickness:
Line style MM
VISIBLE LINES used on each view; includes arcs/circles/curves/title block and border 0.35
HIDDEN LINES used on each view. Dashes start and end with contact to visible or hidden lines 0.35
THIN CONTINUOUS used for dimensioning lines, projection lines 0.18
Center LINES, axis of solid forms, pitch lines 0.18
  • The length and spacing of dashes should be consistent on any particular drawing(s)
  • Chain lines should start and finish with a long dash, but not too long, in a cutting plane.
  • When Centre-lines define Centre points they should cross one another at dash portions of the line.

Points to follow while doing dimension placement

  • ensure that they have dimensions for the height, width, and depth
  • ensure that they have included all crucial dimensions that allow the object to be interpreted
  • Use dimension where the shapes are shown and try to avoid dimensioning hidden lines
  • space dimension lines so that the dimensions are not overcrowded
  • Do not over-dimension the work as it can lead to confusion and an untidy drawing.

Our Approach

At TPDC, we draft your drawing systematically in accordance with the patent office rules and guidelines no matter how much complex your drawing is. Though seldom required, we do your iterations till you are satisfied. To have a look at our work, download few free samples available on our website or visit our website for pricing.

Patent Drawings Resources

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Patent Drawing Samples, Guides, E-books, Case-studies, Whitepapers, Approaches, Methodologies, Sample Reports, etc.

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