Patent US1639742A successfully refreshed from Google Patents.
US1639742A
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US
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Expansible collapsible element
Assignee: American Radiator Co
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Filing: 1925-07-25
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Granted: 1927-08-23
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Expires: 1945-07-25
Abstract
No abstract record available.
Inventors
- 👤 Sue R Mallory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:13
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/14; F16L13/147; G; G05; G05D; G05D23/00; G05D23/01; G05D23/12; Y; Y10; Y10T; Y10T403/00; Y10T403/49; Y10T403/4991
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) | 1930-08-22 | 1931-02-21 | 1931-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-08-22 | 1935-02-21 | 1935-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-08-22 | 1939-02-21 | 1939-08-23 | $7700.00 | Window Closed / Lapsed |