US2715609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valved aeration device
Assignee: Individual
•
Filing: 1951-09-21
•
Granted: 1955-08-16
•
Expires: 1971-09-21
Abstract
No abstract record available.
Inventors
- 👤 Thorwald H Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:40
CPC Classifications
A; A01; A01K; A01K63/00; A01K63/04; A01K63/042
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
IN AN AERATION DEVICE FOR TANKS, A PIPE ADAPTED TO EXTEND BELOW THE LEVEL OF LIQUID IN SAID TANK, AN AIR TUBE EXTENDING ALONG SAID PIPE AND ENTERING THE SAME AT AN UPWARD ANGLE BELOW SAID LEVEL, A SECOND AIR TUBE EXTENDING ALONG SAID PIPE AND ENTERING THE SAME AT AN UPWARD ANGLE AT A DIFFERENT LEVEL, AN AIR CHAMBER ABOVE SAID PIPE,
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-15 | 1959-02-14 | 1959-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-15 | 1963-02-14 | 1963-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-15 | 1967-02-14 | 1967-08-16 | $7700.00 | Window Closed / Lapsed |