US1621913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Ingersoll Rand Co
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Filing: 1925-10-19
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Granted: 1927-03-22
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Expires: 1945-10-19
Abstract
No abstract record available.
Inventors
- 👤 Longacre Frederick Van Duzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:16
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/10; F04B49/00; F04B49/16
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) | 1930-03-21 | 1930-09-20 | 1931-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-03-21 | 1934-09-20 | 1935-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-03-21 | 1938-09-20 | 1939-03-22 | $7700.00 | Window Closed / Lapsed |