US1938557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the thermic production of phosphorus from crude phosphates
Assignee: PEMBROKE CHEMICAL Corp
•
Filing: 1930-06-02
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Granted: 1933-12-05
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Expires: 1950-06-02
Abstract
No abstract record available.
Inventors
- 👤 Stapleton D Gooch
- 👤 Friedrich P Kerschbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:46
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/01; C01B25/02; C01B25/12; 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) | 1936-12-04 | 1937-06-05 | 1937-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-04 | 1941-06-05 | 1941-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-04 | 1945-06-05 | 1945-12-05 | $7700.00 | Window Closed / Lapsed |