Patent US3925935A successfully refreshed from Google Patents.
US3925935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrading system
Assignee: Individual
•
Filing: 1974-08-28
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Granted: 1975-12-16
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Expires: 1994-08-28
Abstract
Abstract A recirculative system for abrading a predetermined portion of a surface with a high velocity stream of abrasive granules is provided in which the granules are aspirated from a supply against the surface to be abraded within a substantially enclosed abrading zone and spent granules are exhausted from the abrading zone and recycled to the supply filtered from any fines.
Inventors
- 👤 Robert U Ricklefs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:11
CPC Classifications
B; B24; B24C; B24C3/00; B24C3/02; B24C3/06; B24C3/065; B24C1/00; B24C1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
Apparatus for continuously rendering the floors of bathtubs slip-resistant by abrading a predetermined portion of the floor with a stream of recycling, abrasive granules and recovering spent granules comprising: an elongated, cylindrical cannister means forming an enclosed supply of abrasive granules, casing means forming an abrading zone positionable adjacent to said predetermined portion of the surface, aspirating means adjacent to said cannister means for drawing abrasive granules from said cannister means and propelling them against said predetermined portion of Said surface in the abrading zone; exhaust means comprising an exhaust line extending from said casing means to the interior of said cannister means and a vacuum source connected by a vacuum line to the interior of said cannister means for applying a vacuum to said exhaust line; filter means in the interior of said cannister means; and said cannister means, casing means, exhaust means, filter means and aspirating means being combined into a single, elongated and generally cylindrical unitary structure whereby the device may be used near the walls of said bathtub.
Claim 2
Dependent Claim
172 words
Apparatus for continuously rendering the floors of bathtubs slip-resistant by abrading a predetermined portion of the floor with a stream of recycling, abrasive granules and recovering spent granules comprising: an elongated, cylindrical cannister means forming an enclosed supply of abrasive granules, casing means forming an abrading zone positionable adjacent to said predetermined portion of the surface, aspirating means adjacent to said cannister means for drawing abrasive granules from said cannister means and propelling them against said predetermined portion of Said surface in the abrading zone; exhaust means comprising an exhaust line extending from said casing means to the interior of said cannister means and a vacuum source connected by a vacuum line to the interior of said cannister means for applying a vacuum to said exhaust line; filter means in the interior of said cannister means; and said cannister means, casing means, exhaust means, filter means and aspirating means being combined into a single, elongated and generally cylindrical unitary structure whereby the device may be used near the walls of said bathtub.
Claim 3
Dependent Claim
59 words
The apparatus of claim 1 further comprising welting means coupled with said casing means, said welting means being positionable on the periphery of said predetermined portion of said surface and forming a boundary of said abrading zone, said welting means having passageways to permit the flow of ambient air therethrough to carry spent granules away from said abrading zone.
Claim 4
Dependent Claim
59 words
The apparatus of claim 2 wherein said aspirating means comprises nozzle means mounted in said casing means and connected to a source of compressed air, and an abrasive supply conduit extending from said cannister means to said nozzle means whereby abrasive granules are drawn through said abrasive supply conduit and propelled through said nozzle means into said casing means.
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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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |