A dust collect device for an eraser
CA 2346602 A1 · Owner: Liu, Te-Hsi · Inventors: Liu, Te-Hsi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a dust collecting device for an eraser or the like dust reducing device, which comprises a first box an inside box being fixed inside , the first box, wherein an outer space is defined between the first box and the inside box, wherein the first box has an air outlet connected with the outer space and a pass, and, wherein the inside box has a trough or opening connecting the outer and inner spaces in which an inhaler component is arranged a door leaf, which sheathes , the, pass of the inside box and contacts the inside box to become substantially airtight, wherein a dust bag, which can be ventilated but through which the dust cannot pass, can be arranged in the …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 9, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 9, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.