Canadian Patents Database / Patent 2541136 Summary
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|(12) Patent:||(11) CA 2541136|
|(54) English Title:||CONCAVE HELIX IMPELLERS PROPULSION SYSTEM|
|(54) French Title:||SYSTEME DE PROPULSION D'HELICE CONCAVE|
|(51) International Patent Classification (IPC):||
|(72) Inventors (Country):||
|(73) Owners (Country):||
|(71) Applicants (Country):||
|(74) Agent:||MOFFAT & CO.|
|(22) Filed Date:||2006-03-28|
|(41) Open to Public Inspection:||2007-09-28|
|(30) Availability of licence:||N/A|
|(30) Language of filing:||English|
A propeller comprising two or more blades extending radially outwardly from a
blade having a continuously concave profile along its axial depth, and
about the hub.
Une hélice comprenant deux pales ou plus s'étendant radialement vers l'extérieur à partir d'un moyeu, chaque pale ayant un profil concave de manière continue le long de sa profondeur axiale, et s'étendant de manière hélicoïdale autour du moyeu.
1. A propeller comprising two or more blades extending radially outwardly from
each blade having a continuously concave profile along its axial depth, and
helically about said hub.
2. A propeller as claimed in claim 1, including a plurality of said blades
around a said hub.
3. A propeller as claimed in claim 2, wherein each said helix extends around
Image where x is the number of blades plus disc ratio spacing intervals in a
4. A propeller as claimed in claim 3, wherein the concave profile of a said
an are that is 180° or less.
5. A propeller as claimed in claim 4, wherein the apex of both the leading and
edges are further from the hub than the radius centre of said edges.
6. A propeller as claimed in any one of claims 1 to 5, wherein said propeller
with a cylindrical perimeter shroud integrally connected to the outer edges of
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|(41) Open to Public Inspection||2007-09-28|
|Next Payment if small entity fee||2018-03-28||$125.00|
|Next Payment if standard fee||2018-03-28||$250.00|
Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following
- the reinstatement fee set out in Item 7 of Schedule II of the Patent Rules;
- the late payment fee set out in Item 22.1 of Schedule II of the Patent Rules; or
- the additional fee for late payment set out in Items 31 and 32 of Schedule II of the Patent Rules.
|Fee Type||Anniversary Year||Due Date||Amount Paid||Paid Date|
|Maintenance Fee - Application - New Act||2||2008-03-28||$50.00||2008-03-13|
|Maintenance Fee - Application - New Act||3||2009-03-30||$50.00||2009-03-23|
|Maintenance Fee - Application - New Act||4||2010-03-29||$50.00||2010-02-05|
|Request for Examination||$400.00||2011-03-09|
|Maintenance Fee - Application - New Act||5||2011-03-28||$100.00||2011-03-11|
|Maintenance Fee - Application - New Act||6||2012-03-28||$100.00||2012-02-06|
|Maintenance Fee - Patent - New Act||7||2013-03-28||$100.00||2013-02-28|
|Maintenance Fee - Patent - New Act||8||2014-03-28||$100.00||2014-03-06|
|Maintenance Fee - Patent - New Act||9||2015-03-30||$100.00||2015-03-11|
|Maintenance Fee - Patent - New Act||10||2016-03-29||$125.00||2016-03-10|
|Maintenance Fee - Patent - New Act||11||2017-03-28||$125.00||2017-03-22|