US4069630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat reflecting window
Assignee: PPG Industries Inc
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Filing: 1976-03-31
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Granted: 1978-01-24
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Expires: 1996-03-31
Abstract
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.
Inventors
- 👤 James S. Chess
- 👤 James A. Davis
- 👤 Robert G. Spindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/66; E06B3/67; E06B3/6715
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
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.
Claim 2
Dependent Claim
127 words
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.
Claim 3
Dependent Claim
41 words
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.
Claim 4
Dependent Claim
16 words
The multiple-glazed window according to claim 2 wherein the interior sheet of glass is clear glass.
Claim 5
Dependent Claim
41 words
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.
Claim 6
Dependent Claim
16 words
The multiple-glazed window according to claim 4 wherein the interior sheet of glass is clear glass.
Claim 7
Dependent Claim
94 words
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.
Claim 8
Dependent Claim
95 words
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.
Claim 9
Dependent Claim
29 words
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.
References Cited (Backward Citations)
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US3296004A
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US3609293A
Cited
US3629554A
Cited
US3710074A
Cited
US3846152A
Cited
US3959565A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |