Heat reflecting window

• US 4,069,630 A
• Filed: 03/31/1976
• Issued: 01/24/1978
• Est. Priority Date: 03/31/1976
• Status: Expired due to Term

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Davis, James A., Spindler, Robert G., Chess, James S.
• Primary Examiner(s): Perham, Alfred C.
• Application Number:
  US05/672,562
• Time in Patent Office: 664 Days
• Field of Search: 52/171, 52/172, 52/616, 52/308, 52/398, 428/34, 428/432
• US Class Current: 52/172
• CPC Class Codes: E06B 3/6715 specially adapted for increased thermal insulation or for controlled passage of light E06B3/66323 takes precedence; coating of glass pains C03C17/00; devices or arrangements for controlling the intensity, colour, phase, polarisation or direction of light G02F1/00

Abstract

Improved thermal insulation between the inside of a building and the outside environment is provided by a multiple-glazed window comprising two transparent glass sheets, an exterior sheet and an interior sheet, spaced from each other and joined about their edges to form a sealed, enclosed space between them as the exterior sheet is a heat-absorbing glass having an infrared reflecting, transparent film of tin oxide disposed on its surface which faces the interior glass sheet in the window.

Claims

1. A multiple-glazed window mounted in a building wall comprising a pair of glass sheets, an exterior sheet of colored, heat-absorbing glass facing the outside environment and an interior sheet, disposed in substantially parallel, spaced relation to each other, a heat reflective, transparent tin oxide-containing coating disposed over substantially all of the inside face of the exterior sheet of glass which faces the interior sheet of glass, a spacer disposed about the inside marginal edges of the pair of sheets to maintain them in spaced relation with a dessicant disposed in the spacer, and a frame about the outside marginal edges of the pair of sheets wherein the margins of the sheets and the spacer are bonded together forming a hermetically sealed space between the sheets of glass.

2. The multiple-glazed window according to claim 1 wherein the exterior sheet of glass is a bronze colored, heat-absorbing glass and the tin oxide film has a thickness sufficient to provide the window with a shading coefficient of from 0.4 to 0.5.

3. The multiple-glazed window according to claim 2 wherein the interior sheet of glass is clear glass.

4. The multiple-glazed window according to claim 1 wherein the exterior sheet of glass is a gray colored, heat-absorbing glass and the tin oxide film has a thickness sufficient to provide the window with a shading coefficient of from 0.5 to 0.6.

5. The multiple-glazed window according to claim 4 wherein the interior sheet of glass is clear glass.

6. The multiple-glazed window according to claim 1 wherein the exterior sheet of glass is a bronze colored, heat-absorbing glass and the tin oxide film has a thickness sufficient to provide the window with a luminous transmittance of from 35 to 45 percent, a transmittance dominant wavelength of from 573 to 583 nanometers, a transmittance excitation purity of from 3 to 15%, an exterior luminous reflectance of from 5 to 15 percent, an exterior reflective dominant wavelength of from 570 to 580 nanometers and an exterior reflective excitation purity of from 5 to 20 percent.

7. The multiple-glazed window according to claim 1 wherein the exterior sheet of glass is a gray colored, heat-absorbing glass and the tin oxide film has a thickness sufficient to provide the window with a luminous transmittance of from 37 to 47 percent, a transmittance dominant wavelength of from 500 to 550c nanometers, a transmittance excitation purity of from 0.2 to 5 percent, an exterior luminous reflectance of from 6 to 12 percent, an exterior reflective dominant wavelength of from 475 to 525c nanometers and an exterior reflective excitation purity of from 2 to 20 percent.

8. The multiple-glazed window according to claim 1 wherein the tin oxide film has a thickness sufficient to provide the window with a summer U-value of from 0.40 to 0.52.