Patent US2972897A successfully refreshed from Google Patents.
US2972897A
Expired / Lapsed
US
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Varying torque heat motor
Assignee: Dole Valve Co
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Filing: 1956-03-30
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Granted: 1961-02-28
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Expires: 1976-03-30
Abstract
No abstract record available.
Inventors
- 👤 Mullapudi M Reddi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:04
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; G05D23/1921; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18888; Y10T74/19; Y10T74/1987; Y10T74/19879; Y10T74/20; Y10T74/20558
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US64940A
Cited
GB190723426A
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US885878A
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US1397987A
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GB325792A
Cited
US2368181A
Cited
US2512212A
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US2594466A
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US2746312A
Cited
US2838943A
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 |