US2591666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometer gauge
Assignee: Individual
•
Filing: 1948-10-20
•
Granted: 1952-04-08
•
Expires: 1968-10-20
Abstract
No abstract record available.
Inventors
- 👤 Walter H Barkas
- 👤 Willard E Buck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:39
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
CH7232A
Cited
US674951A
Cited
US1044502A
Cited
FR444248A
Cited
US1625625A
Cited
US2281280A
Cited
US2338981A
Cited
US2359703A
Cited
US2405960A
Cited
US2425758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |