US1441573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of phosphorus
Assignee: FERRO CHEMICALS Inc
•
Filing: 1919-05-06
•
Granted: 1923-01-09
•
Expires: 1939-05-06
Abstract
No abstract record available.
Inventors
- 👤 Franchot Richard
- 👤 Karl P Mcelroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:01
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/01; C01B25/02; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
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) | 1926-01-08 | 1926-07-10 | 1927-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-01-08 | 1930-07-10 | 1931-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-01-08 | 1934-07-10 | 1935-01-09 | $7700.00 | Window Closed / Lapsed |