US2587693A
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Assignee: Caterpillar Inc
•
Filing: 1947-04-17
•
Granted: 1952-03-04
•
Expires: 1967-04-17
Abstract
No abstract record available.
Inventors
- 👤 George E Burks
- 👤 Ronald R Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:02
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/04; B01D27/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1677892A
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GB401287A
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GB489860A
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GB512972A
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US2218800A
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US2239868A
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US2372865A
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US2569243A
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FR886736A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |