Protective case with attachment interface

1 . A protective case for an electronic device having a touchscreen interface, the protective case comprising:

a cavity for receiving and at least partially enclosing the electronic device;

an aperture in the protective case permitting access to the touchscreen interface of the electronic device when the electronic device is installed in the protective case; and

an attachment interface for attaching an accessory to a back of the protective case,

wherein the attachment interface has an insertion region having a first width and an attachment region having a second width that is smaller than the first width,

wherein the attachment region includes lips on opposing sides of the attachment region,

wherein the lips are configured to removably retain the accessory after the accessory is inserted into the insertion region of the attachment interface and moved to the attachment region of the attachment interface,

wherein the attachment region of the attachment interface further includes one or more interference features proximate the lips of the attachment region for removably retaining the accessory,

wherein the one or more interference features provide an interference fit between the protective case and the accessory,

wherein the interference fit is a snap fit,

wherein the one or more interference features include a ramped portion,

wherein the accessory includes an attachment interface configured to engage the attachment interface of the protective case to removably retain the accessory to the protective case,

wherein the attachment interface of the accessory includes one or more wings configured to engage the lips of the attachment interface of the protective case, respectively, one or more interference features configured to engage the one or more interference features of the attachment interface of the protective case, respectively, and an alignment feature.

2 . The protective case of claim 1 wherein the aperture in the protective case permitting access to the touchscreen interface of the installed electronic device includes a raised protective rim.

3 . A kit for use with an electronic device having a touchscreen interface, the kit comprising:

an accessory; and

a protective case including: a cavity for receiving and at least partially enclosing the electronic device;

an aperture in the protective case permitting access to the touchscreen interface of the electronic device when the electronic device is installed in the protective case; and

an attachment interface for attaching the accessory to a back surface of the protective case, wherein the attachment interface has an insertion region having a first width and an attachment region having a second width that is smaller than the first width, wherein the attachment region includes ledges on opposing sides of the attachment region, and wherein the ledges are configured to removably retain the accessory after the accessory is inserted into the insertion region of the attachment interface and transitioned to the attachment region of the attachment interface,

wherein the attachment region of the attachment interface further includes one or more interference features on the ledges of the attachment region for removably retaining the accessory,

wherein the one or more interference features provide an interference fit between the protective case and the accessory,

wherein the interference fit is a snap fit,

wherein the one or more interference features of the attachment region include a ramped portion,

wherein the accessory includes an attachment interface configured to engage the attachment interface of the protective case to removably retain the accessory to the protective case,

wherein the attachment interface of the accessory includes one or more wings configured to engage the ledges of the attachment interface of the protective case, respectively, one or more interference features configured to engage the one or more interference features of the attachment interface of the protective case, respectively, and an alignment feature.

4 . The kit of claim 3 wherein the aperture in the protective case permitting access to the touchscreen interface of the electronic device includes an elevated rim.

5 . The kit of claim 3 wherein the accessory is configured to electrically interface to the electronic device when the accessory is attached to protective case and the electronic device is installed in the protective case.

6 . The kit of claim 3 further including a second accessory configured to be removably attachable to the protective case.

7 . A case for an electronic device having a user interface, the case comprising:

a cavity for receiving and at least partially enclosing the electronic device;

an aperture in the case permitting access to the user interface of the electronic device when the electronic device is installed in the case; and

an attachment interface for attaching an accessory to a back of the case,

wherein the attachment interface has an insertion region opening having a first width and an attachment region opening having a second width that is smaller than the first width,

wherein the insertion region is contiguous with the attachment region,

wherein the attachment region includes one or more lips along one or more sides of the attachment region,

wherein the one or more lips are adapted to removably retain the accessory after the accessory is inserted into the insertion region of the attachment interface and moved to the attachment region of the attachment interface, and

wherein the attachment region of the attachment interface further includes one or more interference features on each of the one or more lips of the attachment region for removably retaining the accessory,

wherein the one or more interference features provide an interference fit between the case and the accessory,

wherein the interference fit is a friction fit,

wherein the one or more interference features of the attachment region include a ramped portion,

wherein the accessory includes an attachment interface configured to engage the attachment interface of the case to removably retain the accessory to the case,

wherein the attachment interface of the accessory includes one or more wings configured to engage the one or more lips of the attachment interface of the case, respectively, one or more interference features configured to engage the one or more interference features of the attachment interface of the case, respectively, and an alignment feature.

8 . The case of claim 7 wherein the electronic device is one of a mobile phone and a tablet computer.