US1981506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth production and frothproducing reagent
Assignee: PETER C REILLY
•
Filing: 1932-10-26
•
Granted: 1934-11-20
•
Expires: 1952-10-26
Abstract
No abstract record available.
Inventors
- 👤 Mahlin S Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:13
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D2201/00; B03D2201/04; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08; Y; Y10; Y10S; Y10S516/00; Y10S516/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1937-11-19 | 1938-05-21 | 1938-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-11-19 | 1942-05-21 | 1942-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-11-19 | 1946-05-21 | 1946-11-20 | $7700.00 | Window Closed / Lapsed |