US2554070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of finishing lenses
Assignee: SHURON OPTICAL CO Inc
•
Filing: 1946-06-05
•
Granted: 1951-05-22
•
Expires: 1966-06-05
Abstract
No abstract record available.
Inventors
- 👤 Harold J Stead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:47
CPC Classifications
B; B24; B24B; B24B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US369431A
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US554601A
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GB189600443A
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FR508495A
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US1402714A
Cited
US1651181A
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GB263858A
Cited
GB277296A
Cited
CH144847A
Cited
US2000240A
Cited
US2024303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |