US2773041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defoaming composition
Assignee: Individual
•
Filing: 1951-07-16
•
Granted: 1956-12-04
•
Expires: 1971-07-16
Abstract
No abstract record available.
Inventors
- 👤 Rudolph H Larsen
- 👤 Lam Shek Ying
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:01
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1398891A
Cited
US1735547A
Cited
US1930845A
Cited
US2269529A
Cited
US2446806A
Cited
US2461352A
Cited
US2562119A
Cited
US2587268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |