US2570219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometer device having a permanently positioned interference pattern viewing screen
Assignee: Individual
•
Filing: 1949-05-31
•
Granted: 1951-10-09
•
Expires: 1969-05-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert M Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:14
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/45
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1484584A
Cited
FR669880A
Cited
US1957128A
Cited
US2256855A
Cited
DE720333C
Cited
CH234156A
Cited
US2362235A
Cited
US2425758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |