Patent US3380845A successfully refreshed from Google Patents.
US3380845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating opposite sides of web employing electrostatic field
Assignee: Renolit Cramlington Ltd
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Filing: 1963-12-06
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Granted: 1968-04-30
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Expires: 1983-12-06
Abstract
No abstract record available.
Inventors
- 👤 Shapiro Uriel George
- 👤 Neary Francis Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:40
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/50; B; B05; B05B; B05B5/00; B05B5/025; B05B5/057; B05B5/08; B05B5/14; D21H5/00; D21H5/0005; D21H5/0047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A METHOD OF COATING BOTH SIDES OF A WEB OF ELECTRICALLY NON-CONDUCTIVE SHEET MATERIAL WHICH COMPRISES THE STEPS OF: PASSING SAID WEB BETWEEN TWO SPACED APART AND MUTUALLY CONFRONTING ELECTROSTATIC SPARY HEADS; MAINTAINING A HIGH POTENTIAL DIFFERENCE BETWEEN SAID SPRAY HEADS WITH ONE HEAD AT A POLARITY OPPOSITE TO THAT OF THE OTHER HEAD; SUPPLYING FLUID COATING MATERIAL TO SAID TWO SPRAY HEADS AND CAUSING SAID MATERIAL TO BE ATOMISED BY THE FIELD ESTABLISHED BY SAID HIGH POTENTIAL DIFFERENCE SIMULTANEOUSLY AT BOTH SAID HEADS; AND DEPOSITING THE ATOMISED COATING MATERIAL UNDER THE INFLUENCE OF SAID FIELD SIMULTANEOUSLY ON BOTH SIDES OF SAID WEB FROM SAID SPRAY DEVICES ON RESPECTIVE OPPOSITE SIDES THEREOF.
Claim 2
Independent Claim
112 words
A METHOD OF COATING BOTH SIDES OF A WEB OF ELECTRICALLY NON-CONDUCTIVE SHEET MATERIAL WHICH COMPRISES THE STEPS OF: PASSING SAID WEB BETWEEN TWO SPACED APART AND MUTUALLY CONFRONTING ELECTROSTATIC SPARY HEADS; MAINTAINING A HIGH POTENTIAL DIFFERENCE BETWEEN SAID SPRAY HEADS WITH ONE HEAD AT A POLARITY OPPOSITE TO THAT OF THE OTHER HEAD; SUPPLYING FLUID COATING MATERIAL TO SAID TWO SPRAY HEADS AND CAUSING SAID MATERIAL TO BE ATOMISED BY THE FIELD ESTABLISHED BY SAID HIGH POTENTIAL DIFFERENCE SIMULTANEOUSLY AT BOTH SAID HEADS; AND DEPOSITING THE ATOMISED COATING MATERIAL UNDER THE INFLUENCE OF SAID FIELD SIMULTANEOUSLY ON BOTH SIDES OF SAID WEB FROM SAID SPRAY DEVICES ON RESPECTIVE OPPOSITE SIDES THEREOF.
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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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |