US3293020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heating glass sheets
Assignee: PPG Industries Inc
•
Filing: 1963-06-06
•
Granted: 1966-12-20
•
Expires: 1983-06-06
Abstract
No abstract record available.
Inventors
- 👤 George E Sleighter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:04
CPC Classifications
C; C03; C03B; C03B29/00; C03B29/04; C03B29/06; C03B29/08; C03B29/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2068799A
Cited
US3062520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |