Patent US3467602A successfully refreshed from Google Patents.
US3467602A
Expired / Lapsed
US
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Preparing porous refractory oxides by adding and removing polypropylene microspheres
Assignee: Air Products and Chemicals Inc
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Filing: 1966-10-24
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Granted: 1969-09-16
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Expires: 1986-10-24
Abstract
No abstract record available.
Inventors
- 👤 David W Koester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:48
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/009; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/507; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2697066A
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US2723947A
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US2809170A
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US3092454A
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US3162607A
Cited
US3352635A
Cited
US3377269A
Cited
US3361526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |