US2970347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hatch plugs
Assignee: General American Transportation Corp
•
Filing: 1957-05-16
•
Granted: 1961-02-07
•
Expires: 1977-05-16
Abstract
No abstract record available.
Inventors
- 👤 Carl F Massopust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:15
CPC Classifications
B; B61; B61D; B61D19/00; B61D19/003; B61D19/009; Y; Y10; Y10S; Y10S49/00; Y10S49/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2552641A
Cited
US2682111A
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US2639252A
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US2565706A
Cited
US2607302A
Cited
US2753642A
Cited
GB720956A
Cited
US2660194A
Cited
US2794756A
Cited
US2802766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |