Patent US3577681A successfully refreshed from Google Patents.
US3577681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandblasting equipment
Assignee: Individual
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Filing: 1968-12-11
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Granted: 1971-05-04
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Expires: 1988-12-11
Abstract
Abstract A sand aspirator probe for a portable sandblasting apparatus having two parallel tubes of unequal length and welded together along their axes and incorporating therein a sand-air mixing aspirator port in the proximity of the bottom ends of said tubes.
Inventors
- 👤 Norman E Waag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:07
CPC Classifications
B; B24; B24C; B24C7/00; B24C7/0046; B24C3/00; B24C3/02; B24C3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A sand aspirator probe for connection to a sand-air input hose and to a container of sand, said sand aspirator probe comprising two parallel tubes of unequal length welded together, the said length being sufficient to probe into the sand and to extend above the surface of the sand, said tubes being open at both ends and flush at their bottom ends, said tubes comprising a sand tube and an air tube, the sand tube being longer than the air tube to provide a means of attachment to a sand-air input hose connected to a sandblast head, said tubes containing a connecting port having a diameter smaller than the inside diameter of said tubes and drilled near the bottom ends of said tubes, and an opening in said sand tube in alignment with said connecting port.
Claim 2
Dependent Claim
136 words
A sand aspirator probe for connection to a sand-air input hose and to a container of sand, said sand aspirator probe comprising two parallel tubes of unequal length welded together, the said length being sufficient to probe into the sand and to extend above the surface of the sand, said tubes being open at both ends and flush at their bottom ends, said tubes comprising a sand tube and an air tube, the sand tube being longer than the air tube to provide a means of attachment to a sand-air input hose connected to a sandblast head, said tubes containing a connecting port having a diameter smaller than the inside diameter of said tubes and drilled near the bottom ends of said tubes, and an opening in said sand tube in alignment with said connecting port.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |