US3277638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraclean enclosure
Assignee: ENVIRONMENTAL AIR CONTROL COMPANY Inc A CORP OF
•
Filing: 1964-01-17
•
Granted: 1966-10-11
•
Expires: 1984-01-17
Abstract
No abstract record available.
Inventors
- 👤 Charles W Soltis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:02
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2214821A
Cited
US2291220A
Cited
US2550810A
Cited
US2486251A
Cited
US3151929A
Cited
US3170384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |