US2015642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating limestone
Assignee: Electro Lime & Ice Corp
•
Filing: 1931-07-28
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Granted: 1935-09-24
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Expires: 1951-07-28
Abstract
No abstract record available.
Inventors
- 👤 Robert S Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:09
CPC Classifications
C; C04; C04B; C04B2/00; C04B2/10; C04B2/12; C01; C01B; C01B32/00; C01B32/50; 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) | 1938-09-23 | 1939-03-25 | 1939-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-09-23 | 1943-03-25 | 1943-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-09-23 | 1947-03-25 | 1947-09-24 | $7700.00 | Window Closed / Lapsed |