US2695475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method of hardening glass articles
Assignee: American Optical Corp
•
Filing: 1949-10-21
•
Granted: 1954-11-30
•
Expires: 1969-10-21
Abstract
No abstract record available.
Inventors
- 👤 Charles A Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:50
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/04; C03B27/06; C03B27/067
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-29 | 1958-05-31 | 1958-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-29 | 1962-05-31 | 1962-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-29 | 1966-05-31 | 1966-11-30 | $7700.00 | Window Closed / Lapsed |