Patent US3074808A successfully refreshed from Google Patents.
US3074808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for coating the interior of a pipe
Assignee: Phillips Petroleum Co
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Filing: 1959-10-19
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Granted: 1963-01-22
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Expires: 1979-10-19
Abstract
No abstract record available.
Inventors
- 👤 Roy C Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:21
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/18; B05D1/22; B05D1/24; B05D3/00; B05D3/02; B05D3/0254; B05D7/00; B05D7/22; B05D7/222; B05D2401/00; B05D2401/30; B05D2401/32; Y; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A METHOD OF APPLYING THERMOPLASTIC POLYMER POWDER IN A COATING TO THE INTERIOR OF A PIPE WHICH COMPRISES PLACING SAID PIPE IN A VERTICALLY ELONGATED POSITION OVER A POROUS DIAPHRAGM ADOPTED TO SUPPORT SAID POWDER, FILLING SAID PIPE APPROXIMATELY TWO-THIRDS FULL WITH FINELY DIVIDED THERMOPLASTIC POLYMER POWDER, PASSING RELATIVELY COOL INERT GAS UPWARDLY THROHGH SAID DIAPHRAGM AND SAID PIPE THEREBY FLUIDIZING SAID POLYMER AND CAUSING SAID POWDER TO FILL SAID PIPE, HEATING CIRCUMFERENTIALLY THE OUTSIDE OF SAID PIPE AT THE UPPER AND THEREFORE SUFFICIENTLY TO CAUSE THE POLYMER POWDER TO FUSE AND ADHERE TO THE INNER SURFACE OF SAID PIPE OPPOSITE THE LOCUS OF THE HEAT APPLICATION,
Claim 2
Independent Claim
107 words
A METHOD OF APPLYING THERMOPLASTIC POLYMER POWDER IN A COATING TO THE INTERIOR OF A PIPE WHICH COMPRISES PLACING SAID PIPE IN A VERTICALLY ELONGATED POSITION OVER A POROUS DIAPHRAGM ADOPTED TO SUPPORT SAID POWDER, FILLING SAID PIPE APPROXIMATELY TWO-THIRDS FULL WITH FINELY DIVIDED THERMOPLASTIC POLYMER POWDER, PASSING RELATIVELY COOL INERT GAS UPWARDLY THROHGH SAID DIAPHRAGM AND SAID PIPE THEREBY FLUIDIZING SAID POLYMER AND CAUSING SAID POWDER TO FILL SAID PIPE, HEATING CIRCUMFERENTIALLY THE OUTSIDE OF SAID PIPE AT THE UPPER AND THEREFORE SUFFICIENTLY TO CAUSE THE POLYMER POWDER TO FUSE AND ADHERE TO THE INNER SURFACE OF SAID PIPE OPPOSITE THE LOCUS OF THE HEAT APPLICATION,
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |