Patent US2902111A successfully refreshed from Google Patents.
US2902111A
Expired / Lapsed
US
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Diffusion process and apparatus
Assignee: Gulf Research and Development Co
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Filing: 1957-07-12
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Granted: 1959-09-01
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Expires: 1977-07-12
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Henke
- 👤 William A Horne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:14
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE488245C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |