US2360221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope
Assignee: SPENCER LENS CO
•
Filing: 1942-05-27
•
Granted: 1944-10-10
•
Expires: 1962-05-27
Abstract
No abstract record available.
Inventors
- 👤 Albin A Gradisar
- 👤 Gustav E Guellich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:16
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0016; Y; Y10; Y10T; Y10T408/00; Y10T408/21
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) | 1947-10-10 | 1948-04-10 | 1948-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-10-10 | 1952-04-10 | 1952-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-10-10 | 1956-04-10 | 1956-10-10 | $7700.00 | Window Closed / Lapsed |