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US3473905A
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Method and apparatus for providing a gas curtain over a glass furnace window
Assignee: Pilkington Group Ltd
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Filing: 1966-05-02
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Granted: 1969-10-21
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Expires: 1986-05-02
Abstract
No abstract record available.
Inventors
- 👤 John J Jago
- 👤 Deryck T Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:40
CPC Classifications
F; F23; F23M; F23M11/00; F23M11/04; F23M11/042; C; C03; C03B; C03B18/00; C03B18/02; C03B18/16
Claims Analysis
Total Claims: 0
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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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |