US4042402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biocidal glass materials
Assignee: International Standard Electric Corp
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Filing: 1975-12-31
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Granted: 1977-08-16
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Expires: 1995-12-31
Abstract
Abstract Biocidal glass materials are prepared from a mixture of boric oxide, aluminum oxide and cupric oxide in powdered form. After fusing the powder into glass, the glass is ground and deposited in a marine paint composition to provide a paint decomposition rate of 20 micrograms per hour in seawater.
Inventors
- 👤 Cyril Francis Drake
- 👤 Robert Walter James Amos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:18
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/16; C09D5/1687; B; B63; B63B; B63B59/00; B63B59/04; C03; C03C; C03C11/00; C03C3/00; C03C3/12; C03C3/14; C03C3/16; C03C4/00; C03C4/0035; C03C2204/00; C03C2204/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
In a CuO--B 2 O 3--Al 2 O 3 glass anti-foulant of the type used for the controlled release of liquid soluble metal ions into solution in seawater, the improvement whrein: the molar ratio of CuO to B 2 O 3 is from about 2 to 1 to about 1 to 1, the remainder is Al 2 O 3 at about 5 mole percent to provide a dissolution rate of about 0.02 to 0.06 milligrams per hour per square centimeter of copper ions on contact with seawater.
Claim 2
Dependent Claim
87 words
In a CuO--B 2 O 3--Al 2 O 3 glass anti-foulant of the type used for the controlled release of liquid soluble metal ions into solution in seawater, the improvement whrein: the molar ratio of CuO to B 2 O 3 is from about 2 to 1 to about 1 to 1, the remainder is Al 2 O 3 at about 5 mole percent to provide a dissolution rate of about 0.02 to 0.06 milligrams per hour per square centimeter of copper ions on contact with seawater.
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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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |