Improved aggregates, and apparatus and method for making same
CA 2173714 A1 · Owner: Srinivasan, Makuteswara · Inventors: Stobie, John J.; Srinivasan, Makuteswara; Sheppard, Roger P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aggregates, matrices, and composites exhibiting enhanced structural characteristics together with methods and, apparatuses for their manufacture are disclosed. The aggregates of the present invention have a three-dimensional shape a, Tetrastar shape (10), which may be described as a base tetrahedro (the base) with coincident tetrahedra (12 14, 16, 18), joining its four faces, or a Tetrawin shape (30) which may be described as a class of shapes based upon a pair of twin tetrahedra joined on a single face, or the shape (20) of six obelisks (21 22, 23, 24, 25, 26) extending from the six faces of a base cube.
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 October 13, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 13, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 2015.
- 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.