US3683974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purging and filling multiple glazed units
Assignee: PPG Industries Inc
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Filing: 1970-10-08
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Granted: 1972-08-15
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Expires: 1990-10-08
Abstract
Abstract A method for purging and filling a multiple glazed unit with a fluorocarbon gas in which the unit is supported so that its pore hole is located in an upper disposed region of the unit and, while so supported, the gas is injected into the unit and air is simultaneously displaced therefrom.
Inventors
- 👤 John L Stewart
- 👤 Renato J Mazzoni
- 👤 Lester F Schutrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:14
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/66; E06B3/677; E06B3/6775
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A method for purging and filling a multiple glazed unit having a pair of glass sheets sealed together around their marginal edges to provide an air space between the sheets and a pore hole located in a marginal edge portion of the unit comprising supporting the unit with said pore hole located in an upper disposed region of the unit and injecting a fluorocarbon gas through said pore hole into said space while simultaneously displacing air from said space through said pore hole to the exterior of the unit.
Claim 2
Independent Claim
89 words
A method for purging and filling a multiple glazed unit having a pair of glass sheets sealed together around their marginal edges to provide an air space between the sheets and a pore hole located in a marginal edge portion of the unit comprising supporting the unit with said pore hole located in an upper disposed region of the unit and injecting a fluorocarbon gas through said pore hole into said space while simultaneously displacing air from said space through said pore hole to the exterior of the unit.
Claim 3
Dependent Claim
49 words
The method according to claim 1 wherein said gas is injected into said space for a time and at a rate sufficient to produce a concentration of gas within said space of between 85 to 100 percent by volume of gas based on the volume of the air space.
Claim 4
Dependent Claim
38 words
The method according to claim 2 which further includes the step of controlling said time and rate of gas injection to produce said gas concentration with 1.5 volumes of gas based on the volume of the air space.
Claim 5
Dependent Claim
12 words
The method according to claim 1 wherein said unit is vertically disposed.
Claim 6
Dependent Claim
12 words
The method according to claim 1 wherein said unit is horizontally disposed.
Claim 7
Dependent Claim
21 words
The method according to claim 1 wherein said unit is disposed at an angle between a vertical and a horizontal disposition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |