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Patent US2973132A successfully refreshed from Google Patents.
US2973132A
Expired / Lapsed
US
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Unloading means for reciprocating compressor
Assignee: Worthington Corp
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Filing: 1958-10-20
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Granted: 1961-02-28
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Expires: 1978-10-20
Abstract
No abstract record available.
Inventors
- 👤 Sylvan R Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:50
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/02; F04B49/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US774969A
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US1150915A
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US1218507A
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US1272569A
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US2144449A
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US2290858A
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US2565564A
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US2555005A
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US2555004A
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US2761616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |