US4604940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly resilient polyurethane elastomer
Assignee: Northrop Grumman Corp
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Filing: 1985-02-28
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Granted: 1986-08-12
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Expires: 2005-02-28
Abstract
Abstract A resilient polyurethane elastomer structural member is made from (A) a prepolymer prepared from a composition consisting essentially of 2.60 moles to 2.80 moles of 4,4'-diphenylmethane diisocyanate, and about 0.23 mole to about 0.31 mole of a low molecular weight triol, per 1.0 mole of polyoxytetramethylene glycol, and (B) hydroquinone di-( beta -hydroxyethyl) ether, as a chain extender. This polyurethane elastomer can be used to make annular missile shock isolator pads useful for the land based, MX (Peacekeeper) missile.
Inventors
- 👤 Morris A. Mendelsohn
- 👤 Francis W. Navish, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:59
CPC Classifications
F; F16; F16F; F16F3/00; F16F3/08; F16F3/087; F16F3/0873; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; F16F1/00; F16F1/36; F16F1/3605; F16F2236/00; F16F2236/02; F16F2236/027
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A highly resilient polyurethane elastomer structural member, comprising the cured admixture of: (A) about 6.6 to about 7.2 parts by weight of a polyurethane prepolymer prepared from a composition consisting essentially of: (1) 2.60 moles to 2.80 moles of 4,4'-diphenylmethane diisocyanate, (2) about 0.23 mole to about 0.31 mole of a low molecular weight triol having from 5 to 8 carbon atoms, and (3) 1.0 mole of polyoxytetramethylene glycol, with (B) 1.0 part by weight of a hydroquinone di-(β-hydroxyethyl)ether acting as a chain extender.
Claim 2
Dependent Claim
84 words
A highly resilient polyurethane elastomer structural member, comprising the cured admixture of: (A) about 6.6 to about 7.2 parts by weight of a polyurethane prepolymer prepared from a composition consisting essentially of: (1) 2.60 moles to 2.80 moles of 4,4'-diphenylmethane diisocyanate, (2) about 0.23 mole to about 0.31 mole of a low molecular weight triol having from 5 to 8 carbon atoms, and (3) 1.0 mole of polyoxytetramethylene glycol, with (B) 1.0 part by weight of a hydroquinone di-(β-hydroxyethyl)ether acting as a chain extender.
Claim 3
Dependent Claim
37 words
The structural member of claim 1, where the triol is selected from the group consisting of trimethylol ethane, trimethylol propane, trimethylol butane, trimethylol pentane and mixtures thereof, and the structural member is characterized as being highly flexible.
Claim 4
Dependent Claim
100 words
A highly resilient polyurethane elastomer structural member in circumferential contact with a launchable missile, comprising the cured admixture of: (A) about 6.6 to about 7.2 parts by weight of a polyurethane prepolymer prepared from a composition consisting essentially of: (1) 2.60 moles to 2.80 moles of 4,4'-diphenylmethane diisocyanate, (2) about 0.23 mole to about 0.31 mole of a low molecular weight triol selected from the group consisting of trimethylol ethane, trimethylol propane, trimethylol butane, trimethylol pentane and mixtures thereof, and (3) 1.0 mole of polyoxytetramethylene glycol, with (B) 1.0 part by weight of hydroquinone di-(β-hydroxyethyl)ether acting as a chain extender.
Claim 5
Dependent Claim
100 words
A highly resilient polyurethane elastomer structural member in circumferential contact with a launchable missile, comprising the cured admixture of: (A) about 6.6 to about 7.2 parts by weight of a polyurethane prepolymer prepared from a composition consisting essentially of: (1) 2.60 moles to 2.80 moles of 4,4'-diphenylmethane diisocyanate, (2) about 0.23 mole to about 0.31 mole of a low molecular weight triol selected from the group consisting of trimethylol ethane, trimethylol propane, trimethylol butane, trimethylol pentane and mixtures thereof, and (3) 1.0 mole of polyoxytetramethylene glycol, with (B) 1.0 part by weight of hydroquinone di-(β-hydroxyethyl)ether acting as a chain extender.
Claim 6
Dependent Claim
22 words
The structural member of claim 3, where the triol is trimethylol propane, and the structural member is characterized as being highly flexible.
Claim 7
Dependent Claim
16 words
The structural member of claim 3, mounted as a shock isolator pad line on a missile.
Claim 8
Dependent Claim
20 words
The structural member of claim 4, mounted as a shock isolator pad liner on a launch tube surrounding a missile.
Claim 9
Dependent Claim
23 words
The structural member of claim 3, wherein the triol is trimethylol propane having three hydroxy methyl groups attached to the same carbon atom.
Claim 10
Dependent Claim
62 words
The structural member of claim 3 attached to a launchable missile having a bottom firing end and disposed inside a launch tube, said structural member being a shock isolator pad liner, said liner circumferentially contacting the inside of the launch tube and being effective to support the missile in an aligned position and provide shock mitigation generated during firing of the missile.
Claim 11
Dependent Claim
61 words
The structural member of claim 7 attached to a launchable missile having a bottom firing end and disposed inside a launch tube, said structural member being a shock isolator pad liner, said liner circumferentially contacting the inside of the launch tube and being effective to support the missile in an aligned position and provide shock-mitigation generated during firing of the missile.
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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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |