Patent US2833935A successfully refreshed from Google Patents.
Patent US3464341A successfully refreshed from Google Patents.
US3464341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper construction for ventilator duct
Assignee: RUSSELL L DOBRIN
•
Filing: 1967-10-18
•
Granted: 1969-09-02
•
Expires: 1987-10-18
Abstract
No abstract record available.
Inventors
- 👤 Russell L Dobrin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:41
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1413; F24F13/1486
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US83062A
Cited
US3084715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-01 | 1973-03-03 | 1973-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-01 | 1977-03-03 | 1977-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-01 | 1981-03-03 | 1981-09-02 | $7700.00 | Window Closed / Lapsed |