US2972228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for direct contact heating of water
Assignee: Texas Gulf Sulphur Co
•
Filing: 1953-04-06
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Granted: 1961-02-21
•
Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 William P Jensen
- 👤 Hoyt C Hottel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:18
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/22; F22B1/26; F22B1/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE545272C
Cited
US855726A
Cited
US812217A
Cited
GB190804492A
Cited
US2482819A
Cited
US2647370A
Cited
US2781635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |