Patent US2927252A successfully refreshed from Google Patents.
US2927252A
Expired / Lapsed
US
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Integrating instrument
Assignee: Hartley Controls Corp
•
Filing: 1955-05-05
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Granted: 1960-03-01
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Expires: 1975-05-05
Abstract
No abstract record available.
Inventors
- 👤 Hartley Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:02
CPC Classifications
B; B22; B22C; B22C5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2278132A
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US2272256A
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US2404596A
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US2481496A
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US2537771A
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US2548943A
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US2555990A
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US2562385A
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US2505936A
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US2691707A
Cited
US2621233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |