Patent US3523778A successfully refreshed from Google Patents.
US3523778A
Expired / Lapsed
US
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Method and apparatus for injecting a layer of a different glass into a stream of molten glass
Assignee: Pilkington Group Ltd
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Filing: 1967-10-19
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Granted: 1970-08-11
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Expires: 1987-10-19
Abstract
No abstract record available.
Inventors
- 👤 Albert Sidney Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:23
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B18/12; C03B5/00; C03B5/16; C03B5/26; C03B5/265; C03B5/267
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) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |