A document file includes a front cover, a rear cover, a spine portion, a first storage portion provided on an inner surface of the front cover, a second storage portion provided on an inner surface of the rear cover, a sheet bendably connected to the second side edge portion of the front cover and movable between a closed position and an open position, a third storage portion provided on a surface of the sheet opposite the front cover, and a spacer provided on at least one of the second storage portion and the third storage portion for adjusting a space between the second side edge portion of the front cover and the second side edge portion of the rear cover.

A system including a panel having a panel opening and a coupling device coupled to the panel. The coupling device includes a coupling device opening and a flange positioned adjacent to the coupling device opening. The coupling device opening at least partially overlaps with the panel opening, and the flange is elastically deflectable to allow a binding mechanism to pass the flange and into or out of the coupling device opening.

A system including a panel having a panel opening and a coupling device coupled to the panel. The coupling device includes a coupling device opening and a flange positioned adjacent to the coupling device opening. The coupling device opening at least partially overlaps with the panel opening, and the flange is elastically deflectable to allow a binding mechanism to pass the flange and into or out of the coupling device opening.

There is described a multilayer optical thin film structure comprising multiple optically absorbing layers and multiple optically non-absorbing layers. The optically absorbing layers and the optically non-absorbing layers are configured such that light incident on the structure is reflected with a red colour at a first angle, and light incident on the structure is reflected with a yellow colour at a second angle. There is also described an item having applied thereto such a multilayer structure.

The present invention provides a single-detent binder for holding loose-leaf paper sheets, which mainly includes a housing, one pair of symmetrically elongated baseplates, ring shaped components, a control component, and a pull rod. The control component is operable to move the rings for performing the locking and unlocking function. As the handle forms an essential and irreplaceable part of the whole mechanism, embodiments of the present invention disclose a single-detent binder with the control component constructed in a way to improve the durability of the internal components.

The present invention provides a single-detent binder for holding loose-leaf paper sheets, which mainly includes a housing, one pair of symmetrically elongated baseplates, ring shaped components, a control component, and a pull rod. The control component is operable to move the rings for performing the locking and unlocking function. As the handle forms an essential and irreplaceable part of the whole mechanism, embodiments of the present invention disclose a single-detent binder with the control component constructed in a way to improve the durability of the internal components.

A book includes a book cover, pages operably attached to the book cover, and a sheet of lightpaper pivotably attached to an edge of the book cover. The lightpaper sheet, when lit and inserted behind a page may provide light through the page for a user to read or write on the page even in a dark room or in a room without otherwise appropriate lighting.

An apparatus for selectively bracing and squaring opposite covers of a notebook includes a portion associated with an inner surface of one notebook cover and a connector associated with an inner surface of an opposite cover. When the connector and unfolded brace are attached to one another, the notebook is held in a generally square configuration wherein the opposing covers are disposed generally parallel to one another.

A system including a panel having a panel opening and a coupling device coupled to the panel. The coupling device includes a coupling device opening and a flange positioned adjacent to the coupling device opening. The coupling device opening at least partially overlaps with the panel opening, and the flange is elastically deflectable to allow a binding mechanism to pass the flange and into or out of the coupling device opening.

A system including a panel having a panel opening and a coupling device coupled to the panel. The coupling device includes a coupling device opening and a flange positioned adjacent to the coupling device opening. The coupling device opening at least partially overlaps with the panel opening, and the flange is elastically deflectable to allow a binding mechanism to pass the flange and into or out of the coupling device opening.