US1415980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition
Assignee: AT&T Inc
•
Filing: 1920-03-20
•
Granted: 1922-05-16
•
Expires: 1940-03-20
Abstract
No abstract record available.
Inventors
- 👤 Harry T Bellamy
- 👤 Burton T Sweely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:46
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1925-05-15 | 1925-11-14 | 1926-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-05-15 | 1929-11-14 | 1930-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-05-15 | 1933-11-14 | 1934-05-16 | $7700.00 | Window Closed / Lapsed |