US3484948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for exchanging heat between a gas and a particulate matter
Assignee: Individual
•
Filing: 1967-08-09
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Granted: 1969-12-23
•
Expires: 1987-08-09
Abstract
No abstract record available.
Inventors
- 👤 John Campbell Whelan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:47
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/10; F26B17/106; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/36; B01J8/44; F26B3/00; F26B3/02; F26B3/06; F26B3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |