US2418489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass annealing
Assignee: American Optical Corp
•
Filing: 1942-08-01
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Granted: 1947-04-08
•
Expires: 1962-08-01
Abstract
No abstract record available.
Inventors
- 👤 Edgar D Tillyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:04
CPC Classifications
C; C03; C03B; C03B15/00; C03B15/02; C03B15/04; C03B25/00; C03B25/02; C03B25/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1071331A
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US1540264A
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US1585542A
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GB431095A
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US2062836A
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US2148630A
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US2269597A
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US2167482A
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US2147418A
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US2285595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-07 | 1950-10-07 | 1951-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-07 | 1954-10-07 | 1955-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-07 | 1958-10-07 | 1959-04-08 | $7700.00 | Window Closed / Lapsed |