US2422604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas purity testing device
Assignee: American Gas Association Inc
•
Filing: 1943-05-28
•
Granted: 1947-06-17
•
Expires: 1963-05-28
Abstract
No abstract record available.
Inventors
- 👤 Earl J Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:59
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1304208A
Cited
US1185211A
Cited
US1504707A
Cited
US2049987A
Cited
GB505565A
Cited
US2345772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-16 | 1950-12-16 | 1951-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-16 | 1954-12-16 | 1955-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-16 | 1958-12-16 | 1959-06-17 | $7700.00 | Window Closed / Lapsed |