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US2949274A
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Control head
Assignee: Specialties Development Corp
•
Filing: 1956-02-27
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Granted: 1960-08-16
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Expires: 1976-02-27
Abstract
No abstract record available.
Inventors
- 👤 Henry E Heigis
- 👤 Kalisher Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:13
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/46; F16K31/465; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T74/00; Y10T74/11; Y10T74/18; Y10T74/18888; Y10T74/1892; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/2045; Y10T74/20576; Y10T74/20636
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US502563A
Cited
US941703A
Cited
GB313202A
Cited
GB373137A
Cited
GB441279A
Cited
FR1059188A
Cited
US2853263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |