US2554440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Meteorological instrument
Assignee: SERDEX Inc
•
Filing: 1946-02-21
•
Granted: 1951-05-22
•
Expires: 1966-02-21
Abstract
No abstract record available.
Inventors
- 👤 Coburn William Knowlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:10
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/56; G01N25/62; G01W; G01W1/00; G01W1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US822338A
Cited
US2019355A
Cited
US2093767A
Cited
US2044239A
Cited
US2295570A
Cited
US2359278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |