Patent US3238937A successfully refreshed from Google Patents.
US3238937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bust developer
Assignee: Individual
•
Filing: 1963-04-01
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Granted: 1966-03-08
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Expires: 1983-04-01
Abstract
No abstract record available.
Inventors
- 👤 Robert J Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:22
CPC Classifications
A; A61; A61H; A61H9/00; A61H9/005; A61H2205/00; A61H2205/08; A61H2205/082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A PNEUMATIC PULSATOR APPARATUS, COMPRISING IN COMBINATION: (A) A CUP; (B) A PUMP FOR CREATING A PARTIAL VACUUM; (C) A MAIN CONDUIT CONNECTING THE CUP WITH THE PUMP, SAID CONDUIT HAVING A CONSTANTLY OPEN VENT; (D) A VALVE IN THE MAIN CONDUIT FOR CONTROLLING THE VENT; (E) AN AUXILIARY CONDUIT CONNECTING THE CUP WITH ATMOSPHERE, SAID SECOND MENTIONED CONDUIT HAVING A CONSTANTLY OPEN UNIT; (F) A VALVE IN THE AUXILIARY CONDUIT FOR CONTROLLING THE VENT IN THE SECOND MENTIONED CONDUIT; (G) A THIRD VALVE INTERMEDIATE THE FIRST AND SECOND MENTIONED VALVES, SAID THIRD VALVE BEING MOVABLE TO ONE POSITION IN WHICH POSITION THE CUP IS CONNECTED WITH THE PUMP THROUGH THE MAIN CONDUIT AND IN WHICH POSITION THE CUP IS DISCONNECTED FROM THE AUXILIARY CONDUIT, SAID THIRD VALVE BEING MOVABLE TO A SECOND POSITION, IN WHICH SECOND POSITION THE CUP IS DISCONNECTED FROM THE PUMP AND IS CONNECTED WITH THE AUXILIARY CONDUIT; (H) AND MEANS FOR CYCLICALLY SHIFTING THE THIRD VALVE TO AND FROM SAID POSITIONS.
Claim 2
Dependent Claim
166 words
A PNEUMATIC PULSATOR APPARATUS, COMPRISING IN COMBINATION: (A) A CUP; (B) A PUMP FOR CREATING A PARTIAL VACUUM; (C) A MAIN CONDUIT CONNECTING THE CUP WITH THE PUMP, SAID CONDUIT HAVING A CONSTANTLY OPEN VENT; (D) A VALVE IN THE MAIN CONDUIT FOR CONTROLLING THE VENT; (E) AN AUXILIARY CONDUIT CONNECTING THE CUP WITH ATMOSPHERE, SAID SECOND MENTIONED CONDUIT HAVING A CONSTANTLY OPEN UNIT; (F) A VALVE IN THE AUXILIARY CONDUIT FOR CONTROLLING THE VENT IN THE SECOND MENTIONED CONDUIT; (G) A THIRD VALVE INTERMEDIATE THE FIRST AND SECOND MENTIONED VALVES, SAID THIRD VALVE BEING MOVABLE TO ONE POSITION IN WHICH POSITION THE CUP IS CONNECTED WITH THE PUMP THROUGH THE MAIN CONDUIT AND IN WHICH POSITION THE CUP IS DISCONNECTED FROM THE AUXILIARY CONDUIT, SAID THIRD VALVE BEING MOVABLE TO A SECOND POSITION, IN WHICH SECOND POSITION THE CUP IS DISCONNECTED FROM THE PUMP AND IS CONNECTED WITH THE AUXILIARY CONDUIT; (H) AND MEANS FOR CYCLICALLY SHIFTING THE THIRD VALVE TO AND FROM SAID POSITIONS.
References Cited (Backward Citations)
US1355839A
Cited
US1354666A
Cited
US1847658A
Cited
US2098272A
Cited
US2646038A
Cited
US2626601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |