Patent US3031973A successfully refreshed from Google Patents.
US3031973A
Expired / Lapsed
US
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Centrifugal pump with canned motor
Assignee: Individual
•
Filing: 1959-11-30
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Granted: 1962-05-01
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Expires: 1979-11-30
Abstract
No abstract record available.
Inventors
- 👤 Kramer Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:55
CPC Classifications
F; F04; F04D; F04D1/00; F04D1/06; F04D1/063; F04D1/066; F04D13/00; F04D13/02; F04D13/06; F04D13/0606; F04D13/0613; F04D29/00; F04D29/04; F04D29/041; F04D29/0416; F05; F05D; F05D2240/00; F05D2240/60; F05D2240/61
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |