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US3830749A Expired / Lapsed US ⏱️ 0.0 years remaining

Laser glasses with high damage threshold and method of making such glasses

Assignee: American Optical Corp
•
Filing: 1973-04-20
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Granted: 1974-08-20
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Expires: 1993-04-20
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Abstract

Abstract LASER GLASSES HAVING HIGH RESISTANCE TO SELF-DAMAGE DURING OPERATION ARE FORMED IN ALL CERAMIC MELTING UNITS, IN THE PRESENCE OF A FINING AGENT TO ELIMINATE THE FORMATION OF METALLIC INCLUSIONS AND SEMI-CONDUCTIVE INCLUSIONS AND USING BASE GLASS COMPOSITIONS WITH REDUCED TENDENCY TOWARD MICROPHASE SEPARATION AND DEVITTRIFICATION. THE MAJOR INGREDIENTS OF THE GLASS BATCHES INCLUDE SILICON DIOXIDE, ALKALI AND ALKALINE EARTH NITRATES, CARBONATES AND FLUORIDES. THE METHOD INVOLVES INTRODUCING OXIDIZING COMPOUNDS INTO THE REACTION MIXTURE IN A SUFFICIENT AMOUNT THAT DURING THE REACTION AND FINING PHASE, OXIDIZING CONDITIONS ARE MAINTAINED THROUGHOUT THE ENTIRE VOLUME OF THE GLASS MELT.

Inventors

  • 👤 E Deeg
  • 👤 R Graf

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 15:12
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C1/00; C03C1/004; C03C3/089; C03C3/091; C03C3/095; C03C4/00; C03C4/0071

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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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) 1977-08-19 1978-02-18 1978-08-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-08-19 1982-02-18 1982-08-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-08-19 1986-02-18 1986-08-20 $7700.00 Window Closed / Lapsed

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