US3523781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for heating glass melting forehearths
Assignee: Compagnie de Saint Gobain SA
•
Filing: 1967-03-17
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Granted: 1970-08-11
•
Expires: 1987-03-17
Abstract
No abstract record available.
Inventors
- 👤 Maurice J Leveque
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:58
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/235; C03B7/00; C03B7/02; C03B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1893061A
Cited
US2139911A
Cited
US2144973A
Cited
US2337605A
Cited
US3233995A
Cited
US3312454A
Cited
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 |