US2427931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hygrometric means
Assignee: Individual
•
Filing: 1943-12-10
•
Granted: 1947-09-23
•
Expires: 1963-12-10
Abstract
No abstract record available.
Inventors
- 👤 Spanner Edward Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:32
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/56; G01N25/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1098472A
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US1459391A
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US1894104A
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AT127746B
Cited
US1894172A
Cited
US2128176A
Cited
US2151404A
Cited
US2268442A
Cited
US2264966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-22 | 1951-03-24 | 1951-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-22 | 1955-03-24 | 1955-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-22 | 1959-03-24 | 1959-09-23 | $7700.00 | Window Closed / Lapsed |