US3477491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wiped-film evaporator
Assignee: Shell USA Inc
•
Filing: 1968-01-16
•
Granted: 1969-11-11
•
Expires: 1988-01-16
Abstract
No abstract record available.
Inventors
- 👤 Carl Mac Henry
- 👤 John A Weaver
- 👤 Gordon D Towell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:39
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/22; B01D1/222; B01D1/223; B01D1/225; B01D1/226; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/765; B29C48/766; B29C48/03; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2944047A
Cited
US1858956A
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US2542269A
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US3067462A
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US3375549A
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US3211209A
Cited
US3242969A
Cited
US3409937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |