US3493323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sterilizing the air ducts of air-conditioning systems
Assignee: Demuth Development Corp
•
Filing: 1966-10-27
•
Granted: 1970-02-03
•
Expires: 1986-10-27
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Demuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:06
CPC Classifications
F; F24; F24F; F24F8/00; F24F8/20; F24F8/24; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4266
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US625045A
Cited
US1276659A
Cited
US2344536A
Cited
US2523373A
Cited
US2472011A
Cited
US2936770A
Cited
US2683074A
Cited
US3084076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |