US3239591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making clay pipe
Assignee: PACIFIC CLAY PRODUCTS
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Filing: 1965-05-06
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Granted: 1966-03-08
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Expires: 1985-05-06
Abstract
No abstract record available.
Inventors
- 👤 Paul H Wendt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:52
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/02; B28B21/10; B28B21/18; Y; Y10; Y10S; Y10S425/00; Y10S425/044
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
THE METHOD OF MAKING A MOLDED CLAY PIPE, COMPRISING: INTRODUCING GRANULAR CLAY PARTICLES INTO THE UPPER END OF AN ANNULAR SPACE FORMED BETWEEN AN UPRIGHT ELASTOMERIC SLEEVE ENCIRCLING A CENTRAL AXIAL MANDREL, TERMINATING THE INTROUDCTION OF CLAY PARTICLES BEFORE THE ANNULAR SPACE IS FULL TO LEAVE A VOID AT THE UPPER END THEREOF, APPLYING HYDROSTATIC PRESSURE TO CONTRACT THE ELASTOMERIC SLEEVE AND THEREBY COMPACT THE CLAY PARTICLES IN THE ANNULAR SPACE TO FORM A LENGTH OF MOLDED CLAY PIPE, RELAXING THE HYDROSTATIC PRESSURE TO PERMIT THE ELASTOMERIC SLEEVE TO EXPAND RADIALLY AWAY FROM THE PIPE, AND TO PERMIT THE PIPE TO EXPAND RADIALLY AWAY FROMTHE MANDREL AND AXIALLY INTO SAID VOID AND MAINTAINING THE MANDREL AND THE ELASTOMERIC SLEEVE STATIONARY WHILE SIMULTANEOUSLY LOWERING ONLY THE PIPE OUT OF THE LOWER END OF THE ANNULAR SPACE.
Claim 2
Independent Claim
135 words
THE METHOD OF MAKING A MOLDED CLAY PIPE, COMPRISING: INTRODUCING GRANULAR CLAY PARTICLES INTO THE UPPER END OF AN ANNULAR SPACE FORMED BETWEEN AN UPRIGHT ELASTOMERIC SLEEVE ENCIRCLING A CENTRAL AXIAL MANDREL, TERMINATING THE INTROUDCTION OF CLAY PARTICLES BEFORE THE ANNULAR SPACE IS FULL TO LEAVE A VOID AT THE UPPER END THEREOF, APPLYING HYDROSTATIC PRESSURE TO CONTRACT THE ELASTOMERIC SLEEVE AND THEREBY COMPACT THE CLAY PARTICLES IN THE ANNULAR SPACE TO FORM A LENGTH OF MOLDED CLAY PIPE, RELAXING THE HYDROSTATIC PRESSURE TO PERMIT THE ELASTOMERIC SLEEVE TO EXPAND RADIALLY AWAY FROM THE PIPE, AND TO PERMIT THE PIPE TO EXPAND RADIALLY AWAY FROMTHE MANDREL AND AXIALLY INTO SAID VOID AND MAINTAINING THE MANDREL AND THE ELASTOMERIC SLEEVE STATIONARY WHILE SIMULTANEOUSLY LOWERING ONLY THE PIPE OUT OF THE LOWER END OF THE ANNULAR SPACE.
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) | 1969-03-07 | 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 |