US2520977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum lens block
Assignee: LENS BLOCK CORP
•
Filing: 1947-05-08
•
Granted: 1950-09-05
•
Expires: 1967-05-08
Abstract
No abstract record available.
Inventors
- 👤 Suben Morten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:07
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005; Y; Y10; Y10T; Y10T279/00; Y10T279/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US998718A
Cited
US1871113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |