US3448792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal convection condenser and method of use
Assignee: Hooker Chemical Corp
•
Filing: 1966-11-07
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Granted: 1969-06-10
•
Expires: 1986-11-07
Abstract
No abstract record available.
Inventors
- 👤 Willis Thompson Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:49
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0206; F28D1/0213; F28D1/04; F28D7/00; F28D7/02; F28D7/024; F28F; F28F13/00
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |