US1987903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerating means for contact masses
Assignee: Houdry Process Corp
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Filing: 1931-10-17
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Granted: 1935-01-15
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Expires: 1951-10-17
Abstract
No abstract record available.
Inventors
- 👤 Eugene J Houdry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:25
CPC Classifications
C; C10; C10G; C10G11/00; B; B01; B01J; B01J38/00; B01J38/04; B01J38/12; B01J8/00; B01J8/02; B01J8/0242; B01J8/0278; C10G11/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-01-14 | 1938-07-16 | 1939-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-01-14 | 1942-07-16 | 1943-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-01-14 | 1946-07-16 | 1947-01-15 | $7700.00 | Window Closed / Lapsed |