US2706382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for confinement and release of high velocity, hot gases
Assignee: Unifrax I LLC
•
Filing: 1949-07-09
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Granted: 1955-04-19
•
Expires: 1969-07-09
Abstract
No abstract record available.
Inventors
- 👤 Ian M Logan
- 👤 John P Swentzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:14
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346; F02K9/42; F02K9/60; F02K9/62; Y; Y10; Y10S; Y10S60/00; Y10S60/909
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
52 words
A ROCKET MOTOR COMPRISING AN EXTERNAL CYLINDRICAL METAL SHELL AND A REFRACTORY LINING THEREIN INSULATED FROM SAID SHELL BY AN IMTERMEDIATE LAYER OF REFRACTORY INSULATING MATERIAL, SAID LINING BEING UPWARDLY TAPERED AT THE EXIT END OF SAID SHELL TO FORM A RESTRICTED THROAT AREA, SAID REFRACTORY LINING COMPRISING A SILICON NITRIDE-BONDED BODY.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |