US1887704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filling block for heat exchange, reaction, and absorption apparatus
Assignee: Individual
•
Filing: 1928-03-15
•
Granted: 1932-11-15
•
Expires: 1948-03-15
Abstract
No abstract record available.
Inventors
- 👤 Wilisch Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:00
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/02; C21B9/06; B; B01; B01J; B01J19/00; B01J19/32; B01J2219/00; B01J2219/32; B01J2219/322; B01J2219/32293; B01J2219/324; B01J2219/32425; Y; Y10; Y10S; Y10S261/00; Y10S261/72
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) | 1935-11-15 | 1936-05-16 | 1936-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-11-15 | 1940-05-16 | 1940-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-11-15 | 1944-05-16 | 1944-11-15 | $7700.00 | Window Closed / Lapsed |