US2077512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous body
Assignee: PEN CHLOR Inc
•
Filing: 1934-07-07
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Granted: 1937-04-20
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Expires: 1954-07-07
Abstract
No abstract record available.
Inventors
- 👤 Buchloh Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:27
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2072; B01D39/2079; C; C04; C04B; C04B26/00; C04B26/02; C04B26/10; C04B26/12; C04B26/122
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) | 1940-04-19 | 1940-10-19 | 1941-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-04-19 | 1944-10-19 | 1945-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-04-19 | 1948-10-19 | 1949-04-20 | $7700.00 | Window Closed / Lapsed |