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Patent US3233887A successfully refreshed from Google Patents.
US3233887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum chuck
Assignee: Dunham Tool Co Inc
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Filing: 1963-01-28
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Granted: 1966-02-08
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Expires: 1983-01-28
Abstract
No abstract record available.
Inventors
- 👤 Russell H Dunham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:27
CPC Classifications
B; B25; B25B; B25B11/00; B25B11/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A WORK-HOLDING DEVICE FOR RELATIVELY FLAT OBJECTS AND THE LIKE, COMPRISING: (A) A ONE-PIECE UNIVERSAL VACUUM CHUCK HOUSING ADAPTED TO BE ANCHORED TO A FLAT SURFACE; (B) SAID HOUSING HAVING AN UPPER PORTION OF PREDETERMINED OUTLINE; (C) SAID UPPER PORTION DEFINING AN ENDLESS RECESSED SEALING GROOVE AT ITS OUTERMOST SURFACE WITHIN SAID PREDETERMINED OUTLINE; (D) SAID UPPER PORTION DEFINING AN ENDLESS VACUUM CHANNEL AT THE OUTERMOST SURFACE OF SAID UPPER PORTION WITHIN THE OUTLINE OF SAID SEALING GROOVE; (E) AN INTERCHANGEABLE CHUCK PLATE BEING SECURELY FASTENDED TO SAID OUTERMOST SURFACE OF SAID HOUSING AND HAVING TOP AND BOTTOM SURFACES; (F) SAID BOTTOM SURFACE OF SAID PLATE COOPERATING WITH SAID VACUUM CHANNEL TO FORM A VACUUM CHAMBER; (G) AN O-RING BEING LOCATED WITHIN SAID GROOVE AND PROJECTING INTO SEALING CONTACT WITH SAID BOTTOM SURFACE OF SAID CHUCK PLATE TO SEAL IN AN AIR-TIGHT MANNER SAID VACUUM CHAMBER FROM THE EXTERNAL ATMOSPHERE; (H) SAID CHUCK PLATE DEFINING AT LEAST ONE CHUCK PORT; (I) SAID CHUCK PORT COMMUNICATING BETWEEN SAID VACUUM CHAMBER AND SAID TOP SURFACE OF SAID CHUCK PLATE;
Claim 2
Dependent Claim
177 words
A WORK-HOLDING DEVICE FOR RELATIVELY FLAT OBJECTS AND THE LIKE, COMPRISING: (A) A ONE-PIECE UNIVERSAL VACUUM CHUCK HOUSING ADAPTED TO BE ANCHORED TO A FLAT SURFACE; (B) SAID HOUSING HAVING AN UPPER PORTION OF PREDETERMINED OUTLINE; (C) SAID UPPER PORTION DEFINING AN ENDLESS RECESSED SEALING GROOVE AT ITS OUTERMOST SURFACE WITHIN SAID PREDETERMINED OUTLINE; (D) SAID UPPER PORTION DEFINING AN ENDLESS VACUUM CHANNEL AT THE OUTERMOST SURFACE OF SAID UPPER PORTION WITHIN THE OUTLINE OF SAID SEALING GROOVE; (E) AN INTERCHANGEABLE CHUCK PLATE BEING SECURELY FASTENDED TO SAID OUTERMOST SURFACE OF SAID HOUSING AND HAVING TOP AND BOTTOM SURFACES; (F) SAID BOTTOM SURFACE OF SAID PLATE COOPERATING WITH SAID VACUUM CHANNEL TO FORM A VACUUM CHAMBER; (G) AN O-RING BEING LOCATED WITHIN SAID GROOVE AND PROJECTING INTO SEALING CONTACT WITH SAID BOTTOM SURFACE OF SAID CHUCK PLATE TO SEAL IN AN AIR-TIGHT MANNER SAID VACUUM CHAMBER FROM THE EXTERNAL ATMOSPHERE; (H) SAID CHUCK PLATE DEFINING AT LEAST ONE CHUCK PORT; (I) SAID CHUCK PORT COMMUNICATING BETWEEN SAID VACUUM CHAMBER AND SAID TOP SURFACE OF SAID CHUCK PLATE;
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |