Patent US4375522A successfully refreshed from Google Patents.
US4375522A
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Thixotropic restrictor, curable at room temperature, for use on solid propellant grains
Assignee: United States Department of the Navy
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Filing: 1980-07-21
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Granted: 1983-03-01
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Expires: 2000-07-21
Abstract
Abstract A solid propellant restrictor for preventing erosive burning in solid propellant grain critical areas is described. The restrictor is a mixture of hydroxyl-terminated polybutadiene with 1% by weight of dissolved 2,2'-methylene-bis(4-methyl-6-tert-butyl) phenol, dioctyl adipate, triethanolamine, ferric acetylacetonate, carbon black, aluminum oxide, silicon oxide, and toluene diisocyanate, curing at room temperature and illustrates superior hardening, adhesive, and application properties.
Inventors
- 👤 John D. Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:07
CPC Classifications
C; C06; C06B; C06B23/00; C06B23/001; F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
41 words
A solid propellant grain restrictor composition comprising: a premix containing hydroxyl-terminated polybutadiene with 1% by weight of dissolved 2,2'-methylene-bis(4-methyl-6-tert-butyl) phenol antioxidant, dioctyl adipate, triethanolamine, ferric acetylacetonate, carbon black, hydrated aluminum oxide, and colloidal silicon dioxide; toluene diisocyanate; and colloidal silicon dioxide.
Claim 2
Dependent Claim
41 words
A solid propellant grain restrictor composition comprising: a premix containing hydroxyl-terminated polybutadiene with 1% by weight of dissolved 2,2'-methylene-bis(4-methyl-6-tert-butyl) phenol antioxidant, dioctyl adipate, triethanolamine, ferric acetylacetonate, carbon black, hydrated aluminum oxide, and colloidal silicon dioxide; toluene diisocyanate; and colloidal silicon dioxide.
Claim 3
Dependent Claim
43 words
A solid propellant grain restrictor composition according to claim 1 wherein for every 10 g of said premix present, said toluene diisocyanate is present in an amount of 0.310 g and said colloidal silicon dioxide is present in an amount of 0.55 g.
Claim 4
Dependent Claim
43 words
A solid propellant grain restrictor composition according to claim 1 wherein for every 10 g of said premix present, said toluene diisocyanate is present in an amount of 0.296 g and said colloidal silicon dioxide is present in an amount of 0.55 g.
Claim 5
Dependent Claim
62 words
A solid propellant grain restrictor composition according to claim 1, 2 or 3 wherein said premix contains, on a weight basis: about 32.932 percent hydroxyl-terminated polybutadiene with 1% by weight of dissolved 2,2'-methylene-bis(4-methyl-6-tert-butyl) phenol antioxidant; about 12.173 percent dioctyl adipate; about 0.244 percent triethanolamine; about 0.235 percent carbon black; about 48.787 percent hydrated aluminum oxide; and about 5.160 percent colloidal silicon dioxide.
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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) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |