Patent US3725028A successfully refreshed from Google Patents.
US3725028A
Expired / Lapsed
US
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Window structure
Assignee: PPG Industries Inc
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Filing: 1971-10-01
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Granted: 1973-04-03
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Expires: 1991-10-01
Abstract
Abstract Disclosed is a float-bath window structure that yields long-term clear viewing upbath and downbath from its location. The structure comprises first and second panes set at about 90 degrees with respect to each other, first sets of gas-outlet slots near the panes having vanes to direct gas against the glass, and second sets of slot outlets for gas to create second sets of gas curtains parallel to the glass of the panes.
Inventors
- 👤 D Cramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:26
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/42; C03B18/00; C03B18/02; C03B18/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |