US5044129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic mechanical means of paint removal
Assignee: United States Department of the Air Force
•
Filing: 1990-07-05
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Granted: 1991-09-03
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Expires: 2010-07-05
Abstract
Abstract A method for cryogenic removal of paint and other surface coatings is disclosed. Alternate stream pulses of a cryogenic fluid and abrasive beads are directed at a surface coating to alternately embrittle and then shatter the coating. The pulse durations and the time intervals between pulses are generally less than one second and may be on the order of micro and milliseconds. The cryogenic stream pulses may also be alternated with other mechanical paint removal methods.
Inventors
- 👤 Albert Olevitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:42
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B24C1/003
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
41 words
A method for removing coatings from surfaces, comprising the step of directing against a coating alternately pulsed streams of a cryogenic fluid and of solid particles, wherein the duration of each pulse of each alternate stream is less than one second.
Claim 2
Independent Claim
41 words
A method for removing coatings from surfaces, comprising the step of directing against a coating alternately pulsed streams of a cryogenic fluid and of solid particles, wherein the duration of each pulse of each alternate stream is less than one second.
Claim 3
Dependent Claim
26 words
The method for removing coatings from surfaces according to claim 1, wherein the duration of each pulse of each alternate stream is less than one-tenth second.
Claim 4
Dependent Claim
24 words
The method for removing coatings according to claim 1, wherein the time interval between each pulse of alternate streams is less than one second.
Claim 5
Dependent Claim
24 words
The method for removing coatings according to claim 3, wherein the time interval between each pulse of alternate streams is less than one-tenth second.
Claim 6
Dependent Claim
16 words
The method for removing coatings according to claim 1, wherein the solid particles are plastic beads.
Claim 7
Independent Claim
46 words
A method for removing coatings from surfaces, comprising the step of alternating with the application of any mechanical coating removal method the step of directing against the coating a pulsed stream of a cryogenic fluid, wherein the duration of each pulse is less than one second.
Claim 8
Independent Claim
46 words
A method for removing coatings from surfaces, comprising the step of alternating with the application of any mechanical coating removal method the step of directing against the coating a pulsed stream of a cryogenic fluid, wherein the duration of each pulse is less than one second.
Claim 9
Dependent Claim
34 words
The method for removing coatings from surfaces according to claim 6, wherein the time interval between alternately applying the mechanical removal method and each pulse of the cryogenic stream is less than one second.
Claim 10
Independent Claim
47 words
A method for removing coatings from surfaces, comprising the step of directing against a coating three or more successive pairs of alternately pulsed streams of a cryogenic fluid and of solid particles, wherein the duration of each pulse or each alternate stream is less than one second.
Claim 11
Independent Claim
47 words
A method for removing coatings from surfaces, comprising the step of directing against a coating three or more successive pairs of alternately pulsed streams of a cryogenic fluid and of solid particles, wherein the duration of each pulse or each alternate stream is less than one second.
Claim 12
Dependent Claim
26 words
The method for removing coatings from surfaces according to claim 8, wherein the duration of each pulse of each alternate stream is less than one-tenth second.
Claim 13
Dependent Claim
24 words
The method for removing coatings according to claim 8, wherein the time interval between each pulse of alternate streams is less than one second.
Claim 14
Dependent Claim
24 words
The method for removing coatings according to claim 10, wherein the time interval between each pulse of alternate streams is less than one-tenth second.
Claim 15
Dependent Claim
16 words
The method for removing coatings according to claim 8, wherein the solid particles are plastic beads.
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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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |