US2679181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical plummet
Assignee: Keuffel and Esser Co
•
Filing: 1949-07-28
•
Granted: 1954-05-25
•
Expires: 1969-07-28
Abstract
No abstract record available.
Inventors
- 👤 Carl W Keuffel
- 👤 Kissam Philip
- 👤 Allister L Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:43
CPC Classifications
G; G01; G01C; G01C1/00; G01C1/02; G12; G12B; G12B5/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1722209A
Cited
US2485558A
Cited
US928477A
Cited
US940329A
Cited
US973062A
Cited
US1121309A
Cited
US1028224A
Cited
GB141850A
Cited
US1891641A
Cited
US2088262A
Cited
US2399014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |