# US 10,501,981 B2 · Frameless supplemental window for fenestration > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,501,981 B2 - Document ID: US10501981B2 - Status: Granted - Kind: B2 - Application number: 15/845,717 - Filed: 2017-12-18 - Published: 2018-04-19 - Granted: 2019-12-10 - Earliest claimed: 2013-01-07 - Assignees: Wexenergy LLC - Applicants: WexEnergy LLC - Inventors: Ronald M. Wexler - Web page: https://patentgrep.com/patent/US10501981B2 ## CPC - E06B 3/28: with additional removable glass panes or the like, framed or unframed - E06B 1/34: Coverings, e.g. protecting against weather, for decorative purposes - E06B 3/285: {flexible transparent foils without a proper frame fixed and sealed at a distance from the existing glass pane} - E06B 3/30: Coverings, e.g. protecting against weather, for decorative purposes {(for door leaves E06B3/7001)} - G01C 11/04: Interpretation of pictures - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) - G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S) ## Abstract A novel and useful frameless supplemental window for fenestration suitable for use with existing windows. The supplemental window, in one embodiment, comprises plastic sheet material with bullnose edging around it. Corner braces add rigidity and strength to corners in several embodiments. An attachment mechanism secured either to the sheet material or the bullnose edge functions to fasten and/or seal the supplemental window to an existing window. The bullnose edging functions to substantially enclose (i.e. trap) a volume of air between the window pane and the plastic sheet material. The supplemental window is configured such that the layer of trapped air is of an optimum thickness within a preferred range of 0.15 to 0.75 inches to maximize thermal insulation properties of the supplemental window. ## Claims ### Claim 1 A supplemental window apparatus comprising: a substantially non porous sheet material having edges defining a sheet area configured to substantially correspond to a perimeter area of a window pane; a plurality of seals, each of the plurality of seals attached along a separate one of the edges of the substantially non porous sheet material, wherein each of the plurality of seals contacts the window pane near the perimeter area of the window pane when the supplemental window apparatus is mounted to the window pane, wherein pairs of seals of the plurality of seals located on two adjacent edges of the substantially non porous sheet material form a corner opening between the pairs of seals at a corner area of the window pane; a spacer and corner closure positioned at each corner area of the window pane in the corner opening, wherein the corner closure contacts the pairs of seals on two adjacent edges of the substantially non porous sheet material such that a volume of gas is substantially enclosed between the substantially non porous sheet material and the window pane when the supplemental window apparatus is mounted on the window pane; and at least one attachment mechanism configured to attach the supplemental window apparatus to the window pane with the substantially non porous sheet material substantially parallel to the window, wherein the at least one attachment mechanism is configured to be located at least partially in the corner opening between the pairs of seals at the corner area of the window pane and substantially in the perimeter area of the window pane when the supplemental window apparatus is mounted to the window pane. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the at least one attachment mechanism comprises at least two attachment mechanisms configured to attach the supplemental window apparatus to the window pane, wherein each of the at least two attachment mechanisms is configured to be located separately and substantially in the perimeter area of the window pane when the supplemental window apparatus is mounted to the window pane. ### Claim 3 (depends on 2) The apparatus according to claim 2, wherein each of the at least two attachment mechanisms is configured to be located substantially in a corner area of the window pane when the supplemental window apparatus is mounted to the window pane. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein each of the plurality of seals is attached to and extends from the separate one of the edges of the non porous sheet material and contacts an interior facing surface of a sash or a frame holding the window pane when the supplemental window apparatus is mounted on the window pane. ### Claim 5 (depends on 1) The apparatus according to claim 1, wherein the spacer defines a gap between the substantially non porous sheet material and the window pane. ### Claim 6 (depends on 1) The apparatus according to claim 1 further comprising: a constraint configured to hold the substantially non porous sheet material in a position with respect to the window pane. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein the substantially non porous sheet material comprises one of a transparent material, an infrared reflective sheet material, a low emissivity material, a semi-transparent material, a translucent material, or an opaque material. ### Claim 8 (depends on 1) The apparatus according to claim 1, wherein each of the plurality of forms an open arc that contacts the window pane near the perimeter area of the window pane. ### Claim 9 (depends on 1) The apparatus according to claim 1, wherein the plurality of seals are attached directly to the edges of the substantially non porous sheet material.