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US2826307A
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Fluid recirculation systems
Assignee: Individual
•
Filing: 1955-08-22
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Granted: 1958-03-11
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Expires: 1975-08-22
Abstract
No abstract record available.
Inventors
- 👤 Robert M Pace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:52
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/12; E04H4/1209; B; B01; B01D; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D29/39; B01D29/41; B01D29/50; B01D29/56; B01D29/58; B01D2201/00; B01D2201/24
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) | 1961-03-10 | 1961-09-09 | 1962-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-10 | 1965-09-09 | 1966-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-10 | 1969-09-09 | 1970-03-11 | $7700.00 | Window Closed / Lapsed |