Patent US3015469A successfully refreshed from Google Patents.
US3015469A
Expired / Lapsed
US
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Control valve for ventilating ducts
Assignee: Individual
•
Filing: 1961-02-09
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Granted: 1962-01-02
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Expires: 1981-02-09
Abstract
No abstract record available.
Inventors
- 👤 Louis W Falk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:36
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/10; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128; F16L55/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1506418A
Cited
US2177916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-01 | 1965-07-03 | 1966-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-01 | 1969-07-03 | 1970-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-01 | 1973-07-03 | 1974-01-02 | $7700.00 | Window Closed / Lapsed |