US3145746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen changing apparatus
Assignee: National Plastic Products Co Inc
•
Filing: 1963-02-25
•
Granted: 1964-08-25
•
Expires: 1983-02-25
Abstract
No abstract record available.
Inventors
- 👤 Stanford S Scher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:57
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/25; B29C48/36; B29C48/50; B29C48/69; B29C48/691; B29C48/6912
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
AN APPARATUS FOR CHANGING SCREENS COMPRISING A BODY PORTION HAVING A BORE FORMED THEREIN A WEDGESHAPED OPENING IN SAID BODY PORTION, A WEDGE-SHAPED SCREENING FRAME SEATED IN SAID WEDGE-SHAPED OPENING AND A SCREEN MOUNTED IN SAID FRAME AND IN COMMUNICATION WITH SAID BORE, SAID FRAME COMPRISING A PRESSURE PLATE EXTENDING IN A DIRECTION TRANSVERSE TO THE AXIS OF SAID BORE WITH THE EXTREMITY OF SAID PRESSURE PLATE BEING TSHAPED IN CROSS SECTION, MEANS FOR UNSEATING SAID WEDGESHAPED FRAME AND SAID SCREEN THEREIN FROM THE WEDGEOPERATIVELY POSITIONED IN SAID APPARATUS FOR MOVING SAID WEDGE-SHAPED FRAME IN A DIRECTION TRANSVERSE TO SAID BORE AND TOWARDS THE WIDE END OF SAID WEDGE-SHAPED OPENING, SAID MOVING MEANS COMPRISING AN UNDERCUT CARRIER BLOCK SLIDABLY ENGAGING THE HEAD OF SAID T-SHAPED PRESSURE PLATE AND A SINGLE SCREW MEANS FOR RECIPROCATING SAID UNDERCUT BLOCK IN SAID DIRECTION TRANSVERSE TO SAID BORE TO MOVE SAID FRAME TOWARDS THE WIDE END OF SAID WEDGE-SHAPED OPENING, AND AUTOMATIC MEANS FOR EJECTING SAID SCREEN AND FRAME UPON UNSEATING FROM SAID BODY PORTION AND SIMULTANEOUSLY INSERTING A REPLACEMENT SCREEN AND FRAME.
Claim 2
Independent Claim
179 words
AN APPARATUS FOR CHANGING SCREENS COMPRISING A BODY PORTION HAVING A BORE FORMED THEREIN A WEDGESHAPED OPENING IN SAID BODY PORTION, A WEDGE-SHAPED SCREENING FRAME SEATED IN SAID WEDGE-SHAPED OPENING AND A SCREEN MOUNTED IN SAID FRAME AND IN COMMUNICATION WITH SAID BORE, SAID FRAME COMPRISING A PRESSURE PLATE EXTENDING IN A DIRECTION TRANSVERSE TO THE AXIS OF SAID BORE WITH THE EXTREMITY OF SAID PRESSURE PLATE BEING TSHAPED IN CROSS SECTION, MEANS FOR UNSEATING SAID WEDGESHAPED FRAME AND SAID SCREEN THEREIN FROM THE WEDGEOPERATIVELY POSITIONED IN SAID APPARATUS FOR MOVING SAID WEDGE-SHAPED FRAME IN A DIRECTION TRANSVERSE TO SAID BORE AND TOWARDS THE WIDE END OF SAID WEDGE-SHAPED OPENING, SAID MOVING MEANS COMPRISING AN UNDERCUT CARRIER BLOCK SLIDABLY ENGAGING THE HEAD OF SAID T-SHAPED PRESSURE PLATE AND A SINGLE SCREW MEANS FOR RECIPROCATING SAID UNDERCUT BLOCK IN SAID DIRECTION TRANSVERSE TO SAID BORE TO MOVE SAID FRAME TOWARDS THE WIDE END OF SAID WEDGE-SHAPED OPENING, AND AUTOMATIC MEANS FOR EJECTING SAID SCREEN AND FRAME UPON UNSEATING FROM SAID BODY PORTION AND SIMULTANEOUSLY INSERTING A REPLACEMENT SCREEN AND FRAME.
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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |