US3386718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary heat exchanger with a chain drive
Assignee: Allis Chalmers Corp
•
Filing: 1966-08-08
•
Granted: 1968-06-04
•
Expires: 1986-08-08
Abstract
No abstract record available.
Inventors
- 👤 Thomson S Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:57
CPC Classifications
B; B24; B24B; B24B31/00; B24B31/02; F; F27; F27B; F27B7/00; F27B7/20; F27B7/26; F27B7/22; F27B2007/2246; F27B2007/261; F27B2007/262; F27B2007/265; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/1987; Y10T74/19893; Y10T74/1993; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |