How to Create Patent Drawings by Don Boys of Central Coast Patent Agency 

Appreciate your generous sharing of knowledge. About the element numbering, you mentioned new elements in a new figure are from 300 to 3xx. Must the numbering be contiguous from first to last elements in all figures ? Or for ease of description can we start every figure with a new set of number range eg. Fig 1 with 100 to 199 and fig 2 with 200 to 299 and so on so forth and figure one can end at 198 but figure 2 still starts from 200? And must we start numbering from 1? Can embodiment or invention be numbered from 1 or it can be any number? Can I embodiment reference number contain alphabets ? I believe except for figure numbers, reference numbers of elements can contain alphabets eg. 1a 1b

The numbering scheme I proposed is simply a suggestion to keep order and to help a reader follow the spec. You can do just about anything, Numbers need not conform to figure numbers, alphabet characters can be included, no order is demanded.

I am working in these same job mechanical drawings, flow chat and flow diagram but fear we have job in future

That was nicely explained...but can u tell me which 3d modelling software is good for patent drawing....? Thanks .. I'm using SketchUp as a beginner...