US2561700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure gauge
Assignee: Infilco Inc
•
Filing: 1947-09-27
•
Granted: 1951-07-24
•
Expires: 1967-09-27
Abstract
No abstract record available.
Inventors
- 👤 Walter J Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:07
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02; G01L7/08; G01L7/084; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/38; G01F1/386; G01L13/00; G01L13/02; G01L13/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US750752A
Cited
GB191014903A
Cited
US2005773A
Cited
US2052720A
Cited
US2199013A
Cited
US2444358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |