Patent US3895604A successfully refreshed from Google Patents.
US3895604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct coating apparatus
Assignee: Individual
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Filing: 1973-06-15
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Granted: 1975-07-22
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Expires: 1993-06-15
Abstract
Abstract A remote-controlled, self-propelled, vehicular apparatus adapted to travel tractionally within a rectangular duct and, by way of a spraying operation, coat the four walls of the duct internally with a suitable treating liquid such as a solvent, a rust or other corrosion inhibitor, paint, lacquer, or the like.
Inventors
- 👤 John W Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:38
CPC Classifications
B; B05; B05B; B05B13/00; B05B13/06; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/049; Y; Y10; Y10S; Y10S118/00; Y10S118/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
263 words
In a self-propelled vehicular apparatus for applying a liquid coating material to the inner wall surfaces of a rectangular duct having horizontal top and bottom walls and vertical side walls, in combination, a chassis in the form of a rectangular frame having front and rear transverse frame members and a pair of side frame members, front and rear axles projecting across said side frame members, driving drums on the outer ends of the rear axle, driven drums on the outer end of the front axle, crawler treads connecting each driving drum to an associated driven drum, a reversible electric drive motor mounted on said chassis in the medial region thereof, a gear reduction drive mounted on said chassis rearwardly of the motor, means operatively connecting the gear reduction device to the motor, means operatively connecting the gear reduction device to one of said driven drums in driving relationship, a spraying device mounted on said chassis adjacent to the forward end of the latter and having a forwardly facing discharge slot designed for wide angle distribution of sprayed liquid coating material both laterally and vertically for simultaneous application thereof to the horizontal and vertical walls of the duct, a pair of outwardly diverging rollersupporting arms removably bolted to the front transverse frame member of said frame and projecting forwardly and laterally of the frame, a similar pair of roller-supporting arms removably bolted to the rear transverse frame member of said frame and projecting rearwardly and laterally of the frame, and a guide roller rotatably mounted on the distal end of each of said arms.
Claim 2
Dependent Claim
263 words
In a self-propelled vehicular apparatus for applying a liquid coating material to the inner wall surfaces of a rectangular duct having horizontal top and bottom walls and vertical side walls, in combination, a chassis in the form of a rectangular frame having front and rear transverse frame members and a pair of side frame members, front and rear axles projecting across said side frame members, driving drums on the outer ends of the rear axle, driven drums on the outer end of the front axle, crawler treads connecting each driving drum to an associated driven drum, a reversible electric drive motor mounted on said chassis in the medial region thereof, a gear reduction drive mounted on said chassis rearwardly of the motor, means operatively connecting the gear reduction device to the motor, means operatively connecting the gear reduction device to one of said driven drums in driving relationship, a spraying device mounted on said chassis adjacent to the forward end of the latter and having a forwardly facing discharge slot designed for wide angle distribution of sprayed liquid coating material both laterally and vertically for simultaneous application thereof to the horizontal and vertical walls of the duct, a pair of outwardly diverging rollersupporting arms removably bolted to the front transverse frame member of said frame and projecting forwardly and laterally of the frame, a similar pair of roller-supporting arms removably bolted to the rear transverse frame member of said frame and projecting rearwardly and laterally of the frame, and a guide roller rotatably mounted on the distal end of each of said arms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |