US3378431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making carbon-containing glass and product thereof
Assignee: Pfaudler Inc
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Filing: 1967-03-20
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Granted: 1968-04-16
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Expires: 1987-03-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Carlyle F Smith
- 👤 William B Crandall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:07
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/06; C03C2201/00; C03C2201/06; C03C2201/20; C03C2201/26; C03C2203/00; C03C2203/10
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) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |