US3504615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonturbulent fire damper
Assignee: AIR BALANCE Inc
•
Filing: 1968-06-07
•
Granted: 1970-04-07
•
Expires: 1988-06-07
Abstract
No abstract record available.
Inventors
- 👤 John C Kurz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:04
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; A62C2/14; A62C2/16; E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/947; F; F16; F16L; F16L55/00; F16L55/04; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F11/00; F24F11/30; F24F11/32; F24F11/33; F24F11/70; F24F11/72; F24F11/74; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3172347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |