US2724218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surfacing machines
Assignee: American Optical Corp
•
Filing: 1953-08-19
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Granted: 1955-11-22
•
Expires: 1973-08-19
Abstract
No abstract record available.
Inventors
- 👤 Oscar W Dillon
- 👤 Frank H Tuttle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:11
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/04; B24B13/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-21 | 1959-05-23 | 1959-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-21 | 1963-05-23 | 1963-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-21 | 1967-05-23 | 1967-11-22 | $7700.00 | Window Closed / Lapsed |