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US2688867A
Expired / Lapsed
US
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Specific gravity indicator
Assignee: Individual
•
Filing: 1949-02-23
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Granted: 1954-09-14
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Expires: 1969-02-23
Abstract
No abstract record available.
Inventors
- 👤 Foster J Trainor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:17
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/10; G01N9/12; G01N9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1304115A
Cited
US1790696A
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US745942A
Cited
US1964145A
Cited
US1935564A
Cited
US2320417A
Cited
US2393522A
Cited
US2537825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |