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Patent US3512904A successfully refreshed from Google Patents.
US3512904A
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US
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Progressing cavity helical pump
Assignee: Individual
•
Filing: 1968-05-24
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Granted: 1970-05-19
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Expires: 1988-05-24
Abstract
No abstract record available.
Inventors
- 👤 Clifford H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:43
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE21374E
Cited
US2463341A
Cited
US2464011A
Cited
US2874534A
Cited
US3165065A
Cited
US3203350A
Cited
US3299822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |