US2019443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulphur composition
Assignee: Wyeth Holdings LLC
•
Filing: 1932-11-23
•
Granted: 1935-10-29
•
Expires: 1952-11-23
Abstract
No abstract record available.
Inventors
- 👤 Ludwig J Christmann
- 👤 Jr David W Jayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:11
CPC Classifications
A; A01; A01N; A01N59/00; A01N59/02; A01N65/00
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) | 1938-10-28 | 1939-04-29 | 1939-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-10-28 | 1943-04-29 | 1943-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-10-28 | 1947-04-29 | 1947-10-29 | $7700.00 | Window Closed / Lapsed |