Patent US2977979A successfully refreshed from Google Patents.
US2977979A
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Regulating valve
Assignee: Doosan Bobcat North America Inc
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Filing: 1958-11-10
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Granted: 1961-04-04
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Expires: 1978-11-10
Abstract
No abstract record available.
Inventors
- 👤 Woodrow A Hasbany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:42
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/103; F; F16; F16D; F16D25/00; F16D25/12; F16D25/14; F16D48/00; F16D48/02; F16D48/04; F16K; F16K17/00; F16K17/02; F16K17/168; F16K31/00; F16K31/12; F16D2048/0209; F16D2048/0221; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/8593; Y10T137/87265; Y10T137/8741; Y10T137/87499
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |