Patent US2703072A successfully refreshed from Google Patents.
US2703072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indirect heater
Assignee: Petro-Chem Process Co Inc
•
Filing: 1950-07-12
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Granted: 1955-03-01
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Expires: 1970-07-12
Abstract
No abstract record available.
Inventors
- 👤 John W Throckmorton
- 👤 John S Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:35
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/40; F22; F22B; F22B21/00; F22B21/34; F22B21/341; F28; F28D; F28D7/00; F28D7/16; F28D7/163; F28D7/1638
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1866367A
Cited
US1883733A
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US2102424A
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US2130894A
Cited
GB517641A
Cited
US2244567A
Cited
US2540055A
Cited
US2592980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-28 | 1958-08-30 | 1959-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-28 | 1962-08-30 | 1963-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-28 | 1966-08-30 | 1967-03-01 | $7700.00 | Window Closed / Lapsed |