Patent US2642738A successfully refreshed from Google Patents.
US2642738A
Expired / Lapsed
US
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Apparatus for measuring the specific gravity of a gas
Assignee: Individual
•
Filing: 1947-01-11
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Granted: 1953-06-23
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Expires: 1967-01-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Jonathan S Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:20
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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DE268352C
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US1354681A
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US1577395A
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AT114366B
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US1829789A
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US1962861A
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US1945660A
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US1944247A
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US2459483A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |