US2857804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometer
Assignee: Carl Zeiss AG
•
Filing: 1956-02-28
•
Granted: 1958-10-28
•
Expires: 1976-02-28
Abstract
No abstract record available.
Inventors
- 👤 Rantsch Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18; G01C9/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2732760A
Cited
US1044502A
Cited
US1561173A
Cited
DE595211C
Cited
US2660916A
Cited
US2629283A
Cited
US2718811A
Cited
US2701961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |