US3433859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of hardened,dense heat transfer medium
Assignee: McDowell-Wellman Engineering Co
•
Filing: 1966-02-21
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Granted: 1969-03-18
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Expires: 1986-02-21
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Ban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:44
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08; C09K5/14; B; B01; B01J; B01J2/00; B01J2/26
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) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |