Patent US3033534A successfully refreshed from Google Patents.
US3033534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toroidal heat exchangers
Assignee: Motors Liquidation Co
•
Filing: 1959-01-29
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Granted: 1962-05-08
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Expires: 1979-01-29
Abstract
No abstract record available.
Inventors
- 👤 Robert F Caughill
- 👤 Frank A Disinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:56
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0012; F28D9/0018; F28F; F28F3/00; F28F3/02; F28F3/025; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/071
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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |