Described is an electronic delivery door for permitting passage of an object between an interior and an exterior of a structure through an opening defined in the structure, the delivery door comprising: a door panel; a hinge assembly including: one or more hinges for securing the door panel within the opening of the structure and for permitting the door panel to move between a closed position and an open position by rotation of the one or more hinges, wherein: in the closed position, the opening is covered by the door panel; and in the open position, the one or more hinges have been rotated to permit passage of objects through the opening; and an electronic security device configured to selectively permit opening of the door panel.

Described is an electronic delivery door for permitting passage of an object between an interior and an exterior of a structure through an opening defined in the structure, the delivery door comprising: a door panel; a hinge assembly including: one or more hinges for securing the door panel within the opening of the structure and for permitting the door panel to move between a closed position and an open position by rotation of the one or more hinges, wherein: in the closed position, the opening is covered by the door panel; and in the open position, the one or more hinges have been rotated to permit passage of objects through the opening; and an electronic security device configured to selectively permit opening of the door panel.

A thermally insulated door assembly with an operable panel uses a pair of structural panels, a collection of thermally-insulating fasteners, a panel hole and an operable panel. The pair of structural panels are held together by the thermally-insulating fasteners. The thermally-insulating fasteners form a rigid structure that prevents thermal conductivity between the two structural panels that make up the door assembly. This arrangement enables the door assembly to remain a rigid structure while being composed of multiple components. The panel hole traverses through the pair of structural panels to form an opening into which the operable panel is inserted. The operable panel is a panel that replaces a central section of the door assembly. This placement enables the user to remove and replace the operable panel as desired.

An access opening closure device is provided for enabling passage of food or medication into a confined space without providing direct access from within the confined space to outside of the confined space. The device includes a housing assembly including a body and a cover, and a slide assembly including an access door and a frame. The body defines a receptacle and first and second openings. The housing assembly is pivotally coupled to the slide assembly and is movable from an operative position to a stowed, non-operative position.

An access opening closure device is provided for enabling passage of food or medication into a confined space without providing direct access from within the confined space to outside of the confined space. The device includes a housing assembly including a body and a cover, and a slide assembly including an access door and a frame. The body defines a receptacle and first and second openings. The housing assembly is pivotally coupled to the slide assembly and is movable from an operative position to a stowed, non-operative position.

Implementations of detachable window systems may include: a main panel including one or more windows therein, the one or more windows in the main panel each having a window casing, a screen, and a window opening mechanism; an upper panel hingedly coupled to an upper side of the main panel; and a lower panel hingedly coupled to a lower side of the main panel opposing the upper side. The window opening mechanism on each of the one or more windows may be used to open the window to permit air to flow through the screen.

Implementations of detachable window systems may include: a main panel including one or more windows therein, the one or more windows in the main panel each having a window casing, a screen, and a window opening mechanism; an upper panel hingedly coupled to an upper side of the main panel; and a lower panel hingedly coupled to a lower side of the main panel opposing the upper side. The window opening mechanism on each of the one or more windows may be used to open the window to permit air to flow through the screen.

A structured casing built within an exterior door in an exterior doorway. The casing comprises of an access tray with a handle and an inner tray flap on the inside of the enclosed casing that are connected by an assembled bracket system, an access door with a handle and a locking device on the interior back, opposing interior and exterior side panels, an interior and exterior casing top, and a casing bottom. Opening the access tray sets the assembled bracket system in motion causing the inner tray flap to position at a 90-degree angle, forming a flat package receiving space. Closing the access tray further sets the assembled bracket system in motion causing the inner tray flap to return to its starting position releasing the package to the bottom where the package can then be retrieved by unlocking and opening the access door from inside a home or building.

A structured casing built within an exterior door in an exterior doorway. The casing comprises of an access tray with a handle and an inner tray flap on the inside of the enclosed casing that are connected by an assembled bracket system, an access door with a handle and a locking device on the interior back, opposing interior and exterior side panels, an interior and exterior casing top, and a casing bottom. Opening the access tray sets the assembled bracket system in motion causing the inner tray flap to position at a 90-degree angle, forming a flat package receiving space. Closing the access tray further sets the assembled bracket system in motion causing the inner tray flap to return to its starting position releasing the package to the bottom where the package can then be retrieved by unlocking and opening the access door from inside a home or building.

An interchangeable pet door is disclosed. The interchangeable pet door comprises a door, a knob, a plurality of windows, a frame, and a hinge. The knob comprises a latch for securely closing the door. When the interchangeable pet door comprises a hinge, inserting the hinge into a hinge recess securely locks the door. The different elements of the interchangeable pet door are configured to be oriented in a predetermined, interchangeable, or customizable manner. The door is configured to open from, slide into, revolve within, or move in some other non-limiting equivalent way from or relative to a frame.