US2226418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition
Assignee: American Optical Corp
•
Filing: 1936-05-15
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Granted: 1940-12-24
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Expires: 1956-05-15
Abstract
No abstract record available.
Inventors
- 👤 Edgar D Tillyer
- 👤 Harold R Moulton
- 👤 Townsend M Gunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:05
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/17
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) | 1943-12-24 | 1944-06-24 | 1944-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-24 | 1948-06-24 | 1948-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-24 | 1952-06-24 | 1952-12-24 | $7700.00 | Window Closed / Lapsed |