Patent US3421544A successfully refreshed from Google Patents.
Patent US3124989A successfully refreshed from Google Patents.
US3124989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thumim
Assignee: —
•
Filing: —
•
Granted: 1964-03-17
•
Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:40
CPC Classifications
B; B23; B23D; B23D35/00; B23D35/008; B26; B26D; B26D1/00; B26D1/01; B26D1/04; B26D1/06; B26D1/08; B26D1/085; Y; Y10; Y10T; Y10T83/00; Y10T83/626; Y10T83/748; Y10T83/7487; Y10T83/7493; Y10T83/7547
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
IN A KNIFE-CHANGING CONTROL SYSTEM FOR A GUILLOTINE TYPE PAPER CUTTER HAVING A HYDRAULICALLY OPERATED CLAMP, A HYDRAULIC DOUBLE-ENDED CYLINDER AND PISTON THEREIN FOR ACTUATING SAID CLAMP TO UP AND DOWN POSITION, AND MEANS FOR EFFECTING RESTRICTED FLOW FROM THE EXHAUSTING END OF SAID CYLINDER WHEN SAID CLAMP IS BEING MOVED UPWARDLY BY POWER OF SAID PISTON, SAID MEANS COMPRISING A VALVE BIASED TO CLOSING POSITION AND A PASSAGE LEADING FROM AN END OF SAID CYLINDER TO ONE SIDE OF SAID VALVE, AND A PASSAGE LEADING FROM THE OTHER SIDE OF SAID VALVE, WHEREBY FLOW MAY BE SUBSTANTIALLY UNRESTRICTED PAST SAID VALVE WHEN SAID VALVE IS OPEN, A PRESSURE OPERABLE VALVE OPERATING PISTON ELEMENT DISPOSED UPON ACTUATION TO OPEN SAID VALVE, A RESTRICTED FLOW PASSAGEWAY ON THE SAME SIDE OF SAID VALVE AS SAID FIRST-MENTIONED PASSAGEWAY, MEANS FOR EFFECTING PRESSURE ON SAID VALVE OPERATING PISTON FOR MAINTAINING SAID VALVE NORMALLY OPEN, AND MEANS FOR REMOVING PRESSURE FROM SAID VALVE OPERATING PISTON WHEREBY SAID VALVE AUTOMATICALLY CLOSES TO EFFECT MOVEMENT OF EXHAUST FLUID FROM SAID CYLINDER THROUGH SAID RESTRICTED FLOW PASSAGEWAY AT A PREDETERMINED REDUCED RATE WHEREBY THE
Claim 2
Dependent Claim
187 words
IN A KNIFE-CHANGING CONTROL SYSTEM FOR A GUILLOTINE TYPE PAPER CUTTER HAVING A HYDRAULICALLY OPERATED CLAMP, A HYDRAULIC DOUBLE-ENDED CYLINDER AND PISTON THEREIN FOR ACTUATING SAID CLAMP TO UP AND DOWN POSITION, AND MEANS FOR EFFECTING RESTRICTED FLOW FROM THE EXHAUSTING END OF SAID CYLINDER WHEN SAID CLAMP IS BEING MOVED UPWARDLY BY POWER OF SAID PISTON, SAID MEANS COMPRISING A VALVE BIASED TO CLOSING POSITION AND A PASSAGE LEADING FROM AN END OF SAID CYLINDER TO ONE SIDE OF SAID VALVE, AND A PASSAGE LEADING FROM THE OTHER SIDE OF SAID VALVE, WHEREBY FLOW MAY BE SUBSTANTIALLY UNRESTRICTED PAST SAID VALVE WHEN SAID VALVE IS OPEN, A PRESSURE OPERABLE VALVE OPERATING PISTON ELEMENT DISPOSED UPON ACTUATION TO OPEN SAID VALVE, A RESTRICTED FLOW PASSAGEWAY ON THE SAME SIDE OF SAID VALVE AS SAID FIRST-MENTIONED PASSAGEWAY, MEANS FOR EFFECTING PRESSURE ON SAID VALVE OPERATING PISTON FOR MAINTAINING SAID VALVE NORMALLY OPEN, AND MEANS FOR REMOVING PRESSURE FROM SAID VALVE OPERATING PISTON WHEREBY SAID VALVE AUTOMATICALLY CLOSES TO EFFECT MOVEMENT OF EXHAUST FLUID FROM SAID CYLINDER THROUGH SAID RESTRICTED FLOW PASSAGEWAY AT A PREDETERMINED REDUCED RATE WHEREBY THE
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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) | 1967-03-17 | 1967-09-16 | 1968-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-17 | 1971-09-16 | 1972-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-17 | 1975-09-16 | 1976-03-17 | $7700.00 | Window Closed / Lapsed |