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US3493403A
Expired / Lapsed
US
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High titania glass articles and process
Assignee: 3M Co
•
Filing: 1968-08-12
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Granted: 1970-02-03
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Expires: 1988-08-12
Abstract
No abstract record available.
Inventors
- 👤 Chi Fang Tung
- 👤 Warren R Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:17
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB725656A
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US2774675A
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DE976231C
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US2790723A
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US2726161A
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US2992122A
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US3145114A
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US3197810A
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US3149016A
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US3171714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |