1. A filter cartridge comprising:
a housing including opposing first and second shell sections, the shell sections being generally symmetric about a cartridge axis and being joined together, the first shell section having a convex-shape when viewed from a side, the first shell section comprising:
an end portion having an end surface defining a cartridge opening substantially coaxial with said cartridge axis,
a cylindrical side wall portion, and
a transition portion connecting the side wall portion to the end portion,
the transition portion having a radius of 0.125-1.125 inches; and
a filter disposed within the housing, the filter including at least one filter element.
2. The filter cartridge of claim 1 wherein the transition portion has a radius of 0.5-0.625 inches.
3. The filter cartridge of claim 1 wherein the first section end portion also includes a clip element having:
a substantially cylindrical inner side wall segment having oppositely disposed first and second end sections, the inner side wall segment defining the cartridge opening; and
an outer rim segment extending axially inward and radially inward from the end surface to the inner side wall segment first end section.
4. The filter cartridge of claim 3 wherein the clip element also has a circumferential lip segment extends radially outward from the inner side wall segment second end section.
5. The filter cartridge of claim 4 further comprising a sealing grommet mounted within the cartridge opening, the sealing grommet comprising:
an upper shoulder extending radially over the clip element outer rim segment; and
a lower shoulder extending radially under the clip element lip segment.
6. The filter cartridge of claim 5 wherein the sealing grommet also comprises a recess surface disposed intermediate the upper and lower shoulders, the recess surface engaging the clip element inner side wall segment.
7. The filter cartridge of claim 5 wherein the sealing grommet also comprises:
an inner wall defining a bore; and
at least one seal protrusion extending radially inward from the inner wall.
8. The filter cartridge of claim 7 wherein the seal protrusion has a substantially triangular cross-sectional shape.
9. A filter cartridge housing comprising first and second shell sections, the shell sections being generally symmetric about a cartridge axis and being joined together, the first shell section having a convex-shape when viewed from a side and comprising:
an end portion including
an end surface,
clip element having
a substantially cylindrical inner side wall segment having oppositely disposed first and second end sections, the inner side wall segment defining a cartridge opening substantially coaxial with said cartridge axis,
an outer rim segment extending axially inward and radially inward from the end surface to the inner side wall segment first end section, and
a circumferential lip segment extending radially outward from the inner side wall segment second end section;
a cylindrical side wall portion;
a transition portion connecting the side wall portion to the end portion, the transition portion having a radius of 0.125-1.125 inches; and
a sealing grommet mounted within the cartridge opening
10. The filter cartridge housing of claim 9 wherein the transition portion has a radius of 0.5-0.625 inches.
11. The filter cartridge housing of claim 9 wherein the sealing grommet comprises:
an upper shoulder extending radially over the clip element outer rim segment;
a lower shoulder extending radially under the clip element lip segment;
an outer recess surface disposed intermediate the upper and lower shoulders; and
an inner wall defining a bore.
12. The filter cartridge of claim 11 wherein the recess surface engages the clip element inner side wall segment.
13. The filter cartridge of claim 11 wherein the sealing grommet also comprises at least one seal protrusion extending radially inward from the inner wall.
14. The filter cartridge of claim 13 wherein the seal protrusion has a substantially triangular cross-sectional shape.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method, said method comprising:
multicasting a plurality of data units;
initializing a request counter;
multicasting a request for acknowledging receipt of said plurality of data units;
incrementing said request counter;
initializing a timer;
receiving signals responsive to said request;
first determining if said timer has expired prior to receiving said signals from all receivers;
second determining if said signals responsive to said request have been received from all receivers of said request;
third determining whether said request counter has exceeded a retry limit;
updating said request for acknowledgment of said plurality of data units responsive to said third determination;
fourth determining reception status of said plurality of data units based on said received signals;
removing any identification of responding receivers from which said signals responsive to said request for acknowledgment have been received; and
re-multicasting said request for acknowledgement.
2. The method according to claim 1, further comprising:
determining if a lifetime of said data units has been expired; and
re-multicasting said data units responsive to said determination.
3. The method according to claim 1, further comprising receiving an acknowledgment for each multicast request.
4. The method according to claim 1, further comprising transmitting an acknowledgment for each signal received.
5. The method according to claim 1, wherein said signals are delayed.
6. The method according to claim 1, further comprising receiving uplink data from said receivers.
7. The method according to claim 1, wherein said identification is one of an association identifier, a media access control address, an internet protocol address and contained within a bitmap arrangement.
8. An apparatus, comprising:
means for multicasting a plurality of data units;
means for initializing a request counter;
means for multicasting a request for acknowledging receipt of said plurality of data units;
means for incrementing said request counter;
means for initializing a timer;
means for receiving signals responsive to said request;
means for first determining if said timer has expired prior to receiving said signals from all receivers;
means for second determining if said signals responsive to said request have been received from all receivers of said request;
means for third determining whether said request counter has exceeded a retry limit;
means for updating said request for acknowledgment of said plurality of data units responsive to said third determination;
means for fourth determining reception status of said plurality of data units based on said received signals;
means for removing any identification of responding receivers from which said signals responsive to said request for acknowledgment have been received; and
means for re-multicasting said request for acknowledgement.
9. The apparatus according to claim 8, further comprising:
means for fifth determining if a lifetime of said data units has been expired; and
means for re-multicasting said data units responsive to said determination.
10. The apparatus according to claim 8, further comprising means for receiving an acknowledgment for each multicast request.
11. The apparatus according to claim 8, further comprising means for transmitting an acknowledgment for each signal received.
12. The apparatus according to claim 8, wherein said signals are delayed.
13. The apparatus according to claim 8, further comprising means for receiving uplink data from said receivers.
14. The apparatus according to claim 8, wherein said identification is one of an association identifier, a media access control address, an internet protocol address and contained within a bitmap arrangement.