Patent US2616334A successfully refreshed from Google Patents.
US2616334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase microscopy
Assignee: Individual
•
Filing: 1948-05-12
•
Granted: 1952-11-04
•
Expires: 1968-05-12
Abstract
No abstract record available.
Inventors
- 👤 Zernike Frits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:54
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1926716A
Cited
DE636168C
Cited
US2259512A
Cited
US2331716A
Cited
US2427689A
Cited
US2441049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |