Patent US4023497A successfully refreshed from Google Patents.
US4023497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aft-end ignition system for rocket motor
Assignee: Department of National Defence
•
Filing: 1976-03-08
•
Granted: 1977-05-17
•
Expires: 1996-03-08
Abstract
Abstract An igniter for a rocket motor consisting of a cylindrical tube having an open end and a closed end, a reduced section at the closed end, a plurality of segments extending outwardly from near the closed end, a squib secured in the reduced section, a charge in the tube and a polyurethane foam plug in the open end of the tube.
Inventors
- 👤 Elias P. Morris
- 👤 Fred A. Christie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:58
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/0819; C; C06; C06C; C06C9/00; F02; F02K; F02K9/00; F02K9/95; F42B; F42B3/00; F42B3/10; F42B3/11; F42C19/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
An igniter for a rocket motor consisting of a cylindrical tube having an open end and a closed end, a reduced section at the closed end, a plurality of segments extending outwardly from near the closed end and towards the open end; a squib secured in the reduced section, a charge in the tube and a polyurethane foam plug in the open end of the tube, the segments being of such a flexibility and strength that during the detonation of the squib, the igniter is first held in place and then is permitted to move so bending the segments inwardly until they contact and break the cylindrical tube and hence initiate total collapse and ejection of the igniter.
Claim 2
Dependent Claim
118 words
An igniter for a rocket motor consisting of a cylindrical tube having an open end and a closed end, a reduced section at the closed end, a plurality of segments extending outwardly from near the closed end and towards the open end; a squib secured in the reduced section, a charge in the tube and a polyurethane foam plug in the open end of the tube, the segments being of such a flexibility and strength that during the detonation of the squib, the igniter is first held in place and then is permitted to move so bending the segments inwardly until they contact and break the cylindrical tube and hence initiate total collapse and ejection of the igniter.
Claim 3
Dependent Claim
24 words
The igniter of claim 1, including a polyurethane foam cushion around the squib the charge being immovably held between the plug and the cushion.
Claim 4
Dependent Claim
21 words
The igniter of claim 1 wherein the tube is made from a material consisting of 30% glass fibre and 70% Nylon.
Claim 5
Dependent Claim
22 words
The igniter of claim 1 wherein the charge is boron potassium nitrate pellets each of 0.125 inch diameter and 0.188 inch length.
References Cited (Backward Citations)
CA716835A
Cited
US2776623A
Cited
US2990683A
Cited
US3974772A
Cited
DE1216169B
Cited
US3251267A
Cited
US3746214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |