US2601830A
Expired / Lapsed
US
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Assignee: Ambac International Corp
•
Filing: 1949-05-14
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Granted: 1952-07-01
•
Expires: 1969-05-14
Abstract
No abstract record available.
Inventors
- 👤 Martin J Berlyn
- 👤 Carl H Nystrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:26
CPC Classifications
F; F02; F02M; F02M59/00; F04; F04B; F04B1/00; F04B1/12; F04B1/20; F04B1/22; F02M2700/00; F02M2700/13; F02M2700/1317
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE245099C
Cited
US1418951A
Cited
US2087567A
Cited
US2299235A
Cited
US2293693A
Cited
FR885008A
Cited
GB549302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-01 | 1955-12-31 | 1956-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-01 | 1959-12-31 | 1960-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-01 | 1963-12-31 | 1964-07-01 | $7700.00 | Window Closed / Lapsed |